Difference between revisions of "1997 AJHSME Problems"

Revision as of 17:16, 5 December 2010

Problem 1

$\dfrac{1}{10} + \dfrac{9}{100} + \dfrac{9}{1000} + \dfrac{7}{10000} =$

$\text{(A)}\ 0.0026 \qquad \text{(B)}\ 0.0197 \qquad \text{(C)}\ 0.1997 \qquad \text{(D)}\ 0.26 \qquad \text{(E)}\ 1.997$

Solution

Problem 2

Ahn chooses a two-digit integer, subtracts it from 200, and doubles the result. What is the largest number Ahn can get?

$\text{(A)}\ 200 \qquad \text{(B)}\ 202 \qquad \text{(C)}\ 220 \qquad \text{(D)}\ 380 \qquad \text{(E)}\ 398$

Solution

Problem 3

Which of the following numbers is the largest?

$\text{(A)}\ 0.97 \qquad \text{(B)}\ 0.979 \qquad \text{(C)}\ 0.9709 \qquad \text{(D)}\ 0.907 \qquad \text{(E)}\ 0.9089$

Solution

Problem 4

Julie is preparing a speech for her class. Her speech must last between one-half hour and three-quarters of an hour. The ideal rate of speech is 150 words per minute. If Julie speaks at the ideal rate, which of the following number of words would be an appropriate length for her speech?

$\text{(A)}\ 2250 \qquad \text{(B)}\ 3000 \qquad \text{(C)}\ 4200 \qquad \text{(D)}\ 4350 \qquad \text{(E)}\ 5650$

Solution

Problem 5

There are many two-digit multiples of 7, but only two of the multiples have a digit sum of 10. The sum of these two multiples of 7 is

$\text{(A)}\ 119 \qquad \text{(B)}\ 126 \qquad \text{(C)}\ 140 \qquad \text{(D)}\ 175 \qquad \text{(E)}\ 189$

Solution

Problem 6

In the number $74982.1035$ the value of the place occupied by the digit 9 is how many times as great as the value of the place occupied by the digit 3?

$\text{(A)}\ 1,000 \qquad \text{(B)}\ 10,000 \qquad \text{(C)}\ 100,000 \qquad \text{(D)}\ 1,000,000 \qquad \text{(E)}\ 10,000,000$

Solution

Problem 7

The area of the smallest square that will contain a circle of radius 4 is

$\text{(A)}\ 8 \qquad \text{(B)}\ 16 \qquad \text{(C)}\ 32 \qquad \text{(D)}\ 64 \qquad \text{(E)}\ 128$

Solution

Problem 8

Walter gets up at 6:30 a.m., catches the school bus at 7:30 a.m., has 6 classes that last 50 minutes each, has 30 minutes for lunch, and has 2 hours additional time at school. He takes the bus home and arrives at 4:00 p.m. How many minutes has he spent on the bus?

$\text{(A)}\ 30 \qquad \text{(B)}\ 60 \qquad \text{(C)}\ 75 \qquad \text{(D)}\ 90 \qquad \text{(E)}\ 120$

Solution

Problem 9

Three students, with different names, line up single file. What is the probability that they are in alphabetical order from front-to-back?

$\text{(A)}\ \dfrac{1}{12} \qquad \text{(B)}\ \dfrac{1}{9} \qquad \text{(C)}\ \dfrac{1}{6} \qquad \text{(D)}\ \dfrac{1}{3} \qquad \text{(E)}\ \dfrac{2}{3}$

Solution

Problem 10

What fraction of this square region is shaded? Stripes are equal in width, and the figure is drawn to scale.

An image is supposed to go here. You can help us out by creating one and editing it in. Thanks.

$\text{(A)}\ \dfrac{5}{12} \qquad \text{(B)}\ \dfrac{1}{2} \qquad \text{(C)}\ \dfrac{7}{12} \qquad \text{(D)}\ \dfrac{2}{3} \qquad \text{(E)}\ \dfrac{5}{6}$

Solution

Problem 11

Let $\boxed{N}$ mean the number of whole number divisors of $N$ . For example, $\boxed{3}=2$ because 3 has two divisors, 1 and 3. Find the value of

$\boxed{\boxed{11}\times\boxed{20}}.$

$\text{(A)}\ 6 \qquad \text{(B)}\ 8 \qquad \text{(C)}\ 12 \qquad \text{(D)}\ 16 \qquad \text{(E)}\ 24$

Solution

Problem 12

$\angle 1 + \angle 2 = 180^\circ$

$\angle 3 = \angle 4$

Find $\angle 4.$

An image is supposed to go here. You can help us out by creating one and editing it in. Thanks.

$\text{(A)}\ 20^\circ \qquad \text{(B)}\ 25^\circ \qquad \text{(C)}\ 30^\circ \qquad \text{(D)}\ 35^\circ \qquad \text{(E)}\ 40^\circ$

Solution

Problem 13

Three bags of jelly beans contain 26, 28, and 30 beans. The ratios of yellow beans to all beans in each of these bags are $50\%$ , $25\%$ , and $20\%$ , respectively. All three bags of candy are dumped into one bowl. Which of the following is closest to the ratio of yellow jelly beans to all beans in the bowl?

$\text{(A)}\ 31\% \qquad \text{(B)}\ 32\% \qquad \text{(C)}\ 33\% \qquad \text{(D)}\ 35\% \qquad \text{(E)}\ 95\%$

Solution

Problem 14

There is a set of five positive integers whose average (mean) is 5, whose median is 5, and whose only mode is 8. What is the difference between the largest and smallest integers in the set?

$\text{(A)}\ 3 \qquad \text{(B)}\ 5 \qquad \text{(C)}\ 6 \qquad \text{(D)}\ 7 \qquad \text{(E)}\ 8$

Solution

Problem 15

Each side of the large square in the figure is trisected (divided into three equal parts). The corners of an inscribed square are at these trisection points, as shown. The ratio of the area of the inscribed square to the area of the large square is

$\text{(A)}\ \dfrac{\sqrt{3}}{3} \qquad \text{(B)}\ \dfrac{5}{9} \qquad \text{(C)}\ \dfrac{2}{3} \qquad \text{(D)}\ \dfrac{\sqrt{5}}{3} \qquad \text{(E)}\ \dfrac{7}{9}$

Solution

Problem 16

Penni Precisely buys <dollar/>100 worth of stock in each of three companies: Alabama Almonds, Boston Beans, and California Cauliflower. After one year, AA was up 20%, BB was down 25%, and CC was unchanged. For the second year, AA was down 20% from the previous year, BB was up 25% from the previous year, and CC was unchanged. If A, B, and C are the final values of the stock, then

$\text{(A)}\ A=B=C \qquad \text{(B)}\ A=B<C \qquad \text{(C)}\ C<B=A$

$\text{(D)}\ A<B<C \qquad \text{(E)}\ B<A<C$

Solution

Problem 17

A cube has eight vertices (corners) and twelve edges. A segment, such as $x$ , which joins two vertices not joined by an edge is called a diagonal. Segment $y$ is also a diagonal. How many diagonals does a cube have?

An image is supposed to go here. You can help us out by creating one and editing it in. Thanks.

$\text{(A)}\ 6 \qquad \text{(B)}\ 8 \qquad \text{(C)}\ 12 \qquad \text{(D)}\ 14 \qquad \text{(E)}\ 16$

Solution

Problem 18

At the grocery store last week, small boxes of facial tissue were priced at 4 boxes for <dollar/>5. This week they are on sale at 5 boxes for <dollar/>4. The percent decrease in the price per box during the sale was closest to

$\text{(A)}\ 30\% \qquad \text{(B)}\ 35\% \qquad \text{(C)}\ 40\% \qquad \text{(D)}\ 45\% \qquad \text{(E)}\ 65\%$

Solution

Problem 19

If the product $\dfrac{3}{2}\cdot \dfrac{4}{3}\cdot \dfrac{5}{4}\cdot \dfrac{6}{5}\cdot \ldots\cdot \dfrac{a}{b} = 9$ , what is the sum of $a$ and $b$ ?

$\text{(A)}\ 11 \qquad \text{(B)}\ 13 \qquad \text{(C)}\ 17 \qquad \text{(D)}\ 35 \qquad \text{(E)}\ 37$

Solution

Problem 20

A pair of 8-sided dice have sides numbered 1 through 8. Each side has the same probability (chance) of landing face up. The probability that the product of the two numbers that land face-up exceeds 36 is

$\text{(A)}\ \dfrac{5}{32} \qquad \text{(B)}\ \dfrac{11}{64} \qquad \text{(C)}\ \dfrac{3}{16} \qquad \text{(D)}\ \dfrac{1}{4} \qquad \text{(E)}\ \dfrac{1}{2}$

Solution

Problem 21

Each corner cube is removed from this $3\text{ cm}\times 3\text{ cm}\times 3\text{ cm}$ cube. The surface area of the remaining figure is

An image is supposed to go here. You can help us out by creating one and editing it in. Thanks.

$\text{(A)}\ 19\text{ sq.cm} \qquad \text{(B)}\ 24\text{ sq.cm} \qquad \text{(C)}\ 30\text{ sq.cm} \qquad \text{(D)}\ 54\text{ sq.cm} \qquad \text{(E)}\ 72\text{ sq.cm}$

Solution

Problem 22

A two-inch cube $(2\times 2\times 2)$ of silver weighs 3 pounds and is worth <dollar/>200. How much is a three-inch cube of silver worth?

$\text{(A)}\ 300\text{ dollars} \qquad \text{(B)}\ 375\text{ dollars} \qquad \text{(C)}\ 450\text{ dollars} \qquad \text{(D)}\ 560\text{ dollars} \qquad \text{(E)}\ 675\text{ dollars}$

Solution

Problem 23

There are positive integers that have these properties:

the sum of the squares of their digits is 50, and
each digit is larger than the one to its left.

The product of the digits of the largest integer with both properties is

$\text{(A)}\ 7 \qquad \text{(B)}\ 25 \qquad \text{(C)}\ 36 \qquad \text{(D)}\ 48 \qquad \text{(E)}\ 60$

Solution

Problem 24

Diameter $ACE$ is divided at $C$ in the ratio $2:3$ . The two semicircles, $ABC$ and $CDE$ , divide the circular region into an upper (shaded) region and a lower region. The ratio of the area of the upper region to that of the lower region is

An image is supposed to go here. You can help us out by creating one and editing it in. Thanks.

$\text{(A)}\ 2:3 \qquad \text{(B)}\ 1:1 \qquad \text{(C)}\ 3:2 \qquad \text{(D)}\ 9:4 \qquad \text{(E)}\ 5:2$

Solution

Problem 25

All of the even numbers from 2 to 98 inclusive, excluding those ending in 0, are multiplied together. What is the rightmost digit (the units digit) of the product?

$\text{(A)}\ 0 \qquad \text{(B)}\ 2 \qquad \text{(C)}\ 4 \qquad \text{(D)}\ 6 \qquad \text{(E)}\ 8$

Solution

@@ Line 72: / Line 72: @@
 ==Problem 10==
+What fraction of this square region is shaded?  Stripes are equal in width, and the figure is drawn to scale.
+{{image}}
+<math>\text{(A)}\ \dfrac{5}{12} \qquad \text{(B)}\ \dfrac{1}{2} \qquad \text{(C)}\ \dfrac{7}{12} \qquad \text{(D)}\ \dfrac{2}{3} \qquad \text{(E)}\ \dfrac{5}{6}</math>
 [[1997 AJHSME Problems/Problem 10|Solution]]
 ==Problem 11==
+Let <math>\boxed{N}</math> mean the number of whole number divisors of <math>N</math>.  For example, <math>\boxed{3}=2</math> because 3 has two divisors, 1 and 3.  Find the value of
+<cmath>\boxed{\boxed{11}\times\boxed{20}}.</cmath>
+<math>\text{(A)}\ 6 \qquad \text{(B)}\ 8 \qquad \text{(C)}\ 12 \qquad \text{(D)}\ 16 \qquad \text{(E)}\ 24</math>
 [[1997 AJHSME Problems/Problem 11|Solution]]
 ==Problem 12==
+<math>\angle 1 + \angle 2 = 180^\circ </math>
+<math>\angle 3 = \angle 4</math>
+Find <math>\angle 4.</math>
+{{image}}
+<math>\text{(A)}\ 20^\circ \qquad \text{(B)}\ 25^\circ \qquad \text{(C)}\ 30^\circ \qquad \text{(D)}\ 35^\circ \qquad \text{(E)}\ 40^\circ</math>
 [[1997 AJHSME Problems/Problem 12|Solution]]
 ==Problem 13==
+Three bags of jelly beans contain 26, 28, and 30 beans.  The ratios of yellow beans to all beans in each of these bags are <math>50\%</math>, <math>25\%</math>, and <math>20\%</math>, respectively.  All three bags of candy are dumped into one bowl.  Which of the following is closest to the ratio of yellow jelly beans to all beans in the bowl?
+<math>\text{(A)}\ 31\% \qquad \text{(B)}\ 32\% \qquad \text{(C)}\ 33\% \qquad \text{(D)}\ 35\% \qquad \text{(E)}\ 95\%</math>
 [[1997 AJHSME Problems/Problem 13|Solution]]
 ==Problem 14==
+There is a set of five positive integers whose average (mean) is 5, whose median is 5, and whose only mode is 8.  What is the difference between the largest and smallest integers in the set?
+<math>\text{(A)}\ 3 \qquad \text{(B)}\ 5 \qquad \text{(C)}\ 6 \qquad \text{(D)}\ 7 \qquad \text{(E)}\ 8</math>
 [[1997 AJHSME Problems/Problem 14|Solution]]
 ==Problem 15==
+Each side of the large square in the figure is trisected (divided into three equal parts).  The corners of an inscribed square are at these trisection points, as shown.  The ratio of the area of the inscribed square to the area of the large square is
+<math>\text{(A)}\ \dfrac{\sqrt{3}}{3} \qquad \text{(B)}\ \dfrac{5}{9} \qquad \text{(C)}\ \dfrac{2}{3} \qquad \text{(D)}\ \dfrac{\sqrt{5}}{3} \qquad \text{(E)}\ \dfrac{7}{9}</math>
 [[1997 AJHSME Problems/Problem 15|Solution]]
 ==Problem 16==
+Penni Precisely buys <dollar/>100 worth of stock in each of three companies: Alabama Almonds, Boston Beans, and California Cauliflower.  After one year, AA was up 20%, BB was down 25%, and CC was unchanged.  For the second year, AA was down 20% from the previous year, BB was up 25% from the previous year, and CC was unchanged.  If A, B, and C are the final values of the stock, then
+<math>\text{(A)}\ A=B=C \qquad \text{(B)}\ A=B<C \qquad \text{(C)}\ C<B=A</math>
+<math>\text{(D)}\ A<B<C \qquad \text{(E)}\ B<A<C</math>
 [[1997 AJHSME Problems/Problem 16|Solution]]
 ==Problem 17==
+A cube has eight vertices (corners) and twelve edges.  A segment, such as <math>x</math>, which joins two vertices not joined by an edge is called a diagonal.  Segment <math>y</math> is also a diagonal.  How many diagonals does a cube have?
+{{image}}
+<math>\text{(A)}\ 6 \qquad \text{(B)}\ 8 \qquad \text{(C)}\ 12 \qquad \text{(D)}\ 14 \qquad \text{(E)}\ 16</math>
 [[1997 AJHSME Problems/Problem 17|Solution]]
 ==Problem 18==
+At the grocery store last week, small boxes of facial tissue were priced at 4 boxes for <dollar/>5.  This week they are on sale at 5 boxes for <dollar/>4.  The percent decrease in the price per box during the sale was closest to
+<math>\text{(A)}\ 30\% \qquad \text{(B)}\ 35\% \qquad \text{(C)}\ 40\% \qquad \text{(D)}\ 45\% \qquad \text{(E)}\ 65\%</math>
 [[1997 AJHSME Problems/Problem 18|Solution]]
 ==Problem 19==
+If the product <math>\dfrac{3}{2}\cdot \dfrac{4}{3}\cdot \dfrac{5}{4}\cdot \dfrac{6}{5}\cdot \ldots\cdot \dfrac{a}{b} = 9</math>, what is the sum of <math>a</math> and <math>b</math>?
+<math>\text{(A)}\ 11 \qquad \text{(B)}\ 13 \qquad \text{(C)}\ 17 \qquad \text{(D)}\ 35 \qquad \text{(E)}\ 37</math>
 [[1997 AJHSME Problems/Problem 19|Solution]]
 ==Problem 20==
+A pair of 8-sided dice have sides numbered 1 through 8.  Each side has the same probability (chance) of landing face up.  The probability that the product of the two numbers that land face-up exceeds 36 is
+<math>\text{(A)}\ \dfrac{5}{32} \qquad \text{(B)}\ \dfrac{11}{64} \qquad \text{(C)}\ \dfrac{3}{16} \qquad \text{(D)}\ \dfrac{1}{4} \qquad \text{(E)}\ \dfrac{1}{2}</math>
 [[1997 AJHSME Problems/Problem 20|Solution]]
 ==Problem 21==
+Each corner cube is removed from this <math>3\text{ cm}\times 3\text{ cm}\times 3\text{ cm}</math> cube.  The surface area of the remaining figure is
+{{image}}
+<math>\text{(A)}\ 19\text{ sq.cm} \qquad \text{(B)}\ 24\text{ sq.cm} \qquad \text{(C)}\ 30\text{ sq.cm} \qquad \text{(D)}\ 54\text{ sq.cm} \qquad \text{(E)}\ 72\text{ sq.cm}</math>
 [[1997 AJHSME Problems/Problem 21|Solution]]
 ==Problem 22==
+A two-inch cube <math>(2\times 2\times 2)</math> of silver weighs 3 pounds and is worth <dollar/>200.  How much is a three-inch cube of silver worth?
+<math>\text{(A)}\ 300\text{ dollars} \qquad \text{(B)}\ 375\text{ dollars} \qquad \text{(C)}\ 450\text{ dollars} \qquad \text{(D)}\ 560\text{ dollars} \qquad \text{(E)}\ 675\text{ dollars}</math>
 [[1997 AJHSME Problems/Problem 22|Solution]]
 ==Problem 23==
+There are positive integers that have these properties:
+* the sum of the squares of their digits is 50, and
+* each digit is larger than the one to its left.
+The product of the digits of the largest integer with both properties is
+<math>\text{(A)}\ 7 \qquad \text{(B)}\ 25 \qquad \text{(C)}\ 36 \qquad \text{(D)}\ 48 \qquad \text{(E)}\ 60</math>
 [[1997 AJHSME Problems/Problem 23|Solution]]
 ==Problem 24==
+Diameter <math>ACE</math> is divided at <math>C</math> in the ratio <math>2:3</math>.  The two semicircles, <math>ABC</math> and <math>CDE</math>, divide the circular region into an upper (shaded) region and a lower region.  The ratio of the area of the upper region to that of the lower region is
+{{image}}
+<math>\text{(A)}\ 2:3 \qquad \text{(B)}\ 1:1 \qquad \text{(C)}\ 3:2 \qquad \text{(D)}\ 9:4 \qquad \text{(E)}\ 5:2</math>
 [[1997 AJHSME Problems/Problem 24|Solution]]
 ==Problem 25==
+All of the even numbers from 2 to 98 inclusive, excluding those ending in 0, are multiplied together.  What is the rightmost digit (the units digit) of the product?
+<math>\text{(A)}\ 0 \qquad \text{(B)}\ 2 \qquad \text{(C)}\ 4 \qquad \text{(D)}\ 6 \qquad \text{(E)}\ 8</math>
 [[1997 AJHSME Problems/Problem 25|Solution]]

1997 AJHSME (Problems • Answer Key • Resources)
Preceded by 1996 AJHSME	Followed by 1998 AJHSME
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25
All AJHSME/AMC 8 Problems and Solutions

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Difference between revisions of "1997 AJHSME Problems"

Revision as of 17:16, 5 December 2010

Contents

Problem 1

Problem 2

Problem 3

Problem 4

Problem 5

Problem 6

Problem 7

Problem 8

Problem 9

Problem 10

Problem 11

Problem 12

Problem 13

Problem 14

Problem 15

Problem 16

Problem 17

Problem 18

Problem 19

Problem 20

Problem 21

Problem 22

Problem 23

Problem 24

Problem 25

See also