# Difference between revisions of "2003 AMC 10A Problems"

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A large equilateral triangle is constructed by using toothpicks to create rows of small equilateral triangles. For example, in the figure we have <math>3</math> rows of small congruent equilateral triangles, with <math>5</math> small triangles in the base row. How many toothpicks would be needed to construct a large equilateral triangle if the base row of the triangle consists of <math>2003</math> small equilateral triangles? | A large equilateral triangle is constructed by using toothpicks to create rows of small equilateral triangles. For example, in the figure we have <math>3</math> rows of small congruent equilateral triangles, with <math>5</math> small triangles in the base row. How many toothpicks would be needed to construct a large equilateral triangle if the base row of the triangle consists of <math>2003</math> small equilateral triangles? | ||

− | [ | + | <asy> |

− | + | unitsize(15mm); | |

+ | defaultpen(linewidth(.8pt)+fontsize(8pt)); | ||

+ | pair Ap=(0,0), Bp=(1,0), Cp=(2,0), Dp=(3,0), Gp=dir(60); | ||

+ | pair Fp=shift(Gp)*Bp, Ep=shift(Gp)*Cp; | ||

+ | pair Hp=shift(Gp)*Gp, Ip=shift(Gp)*Fp; | ||

+ | pair Jp=shift(Gp)*Hp; | ||

+ | pair[] points={Ap,Bp,Cp,Dp,Ep,Fp,Gp,Hp,Ip,Jp}; | ||

+ | draw(Ap--Dp--Jp--cycle); | ||

+ | draw(Gp--Bp--Ip--Hp--Cp--Ep--cycle); | ||

+ | for(pair p : points) | ||

+ | { | ||

+ | fill(circle(p, 0.07),white); | ||

+ | } | ||

+ | pair[] Cn=new pair[5]; | ||

+ | Cn[0]=centroid(Ap,Bp,Gp); | ||

+ | Cn[1]=centroid(Gp,Bp,Fp); | ||

+ | Cn[2]=centroid(Bp,Fp,Cp); | ||

+ | Cn[3]=centroid(Cp,Fp,Ep); | ||

+ | Cn[4]=centroid(Cp,Ep,Dp); | ||

+ | label("$1$",Cn[0]); | ||

+ | label("$2$",Cn[1]); | ||

+ | label("$3$",Cn[2]); | ||

+ | label("$4$",Cn[3]); | ||

+ | label("$5$",Cn[4]); | ||

+ | for (pair p : Cn) | ||

+ | { | ||

+ | draw(circle(p,0.1)); | ||

+ | }</asy> | ||

<math> \mathrm{(A) \ } 1,004,004 \qquad \mathrm{(B) \ } 1,005,006 \qquad \mathrm{(C) \ } 1,507,509 \qquad \mathrm{(D) \ } 3,015,018 \qquad \mathrm{(E) \ } 6,021,018 </math> | <math> \mathrm{(A) \ } 1,004,004 \qquad \mathrm{(B) \ } 1,005,006 \qquad \mathrm{(C) \ } 1,507,509 \qquad \mathrm{(D) \ } 3,015,018 \qquad \mathrm{(E) \ } 6,021,018 </math> | ||

## Revision as of 11:18, 26 August 2011

## Contents

- 1 Problem 1
- 2 Problem 2
- 3 Problem 3
- 4 Problem 4
- 5 Problem 5
- 6 Problem 6
- 7 Problem 7
- 8 Problem 8
- 9 Problem 9
- 10 Problem 10
- 11 Problem 11
- 12 Problem 12
- 13 Problem 13
- 14 Problem 14
- 15 Problem 15
- 16 Problem 16
- 17 Problem 17
- 18 Problem 18
- 19 Problem 19
- 20 Problem 20
- 21 Problem 21
- 22 Problem 22
- 23 Problem 23
- 24 Problem 24
- 25 Problem 25
- 26 See also

## Problem 1

What is the difference between the sum of the first even counting numbers and the sum of the first odd counting numbers?

## Problem 2

Members of the Rockham Soccer League buy socks and T-shirts. Socks cost $4 per pair and each T-shirt costs $5 more than a pair of socks. Each member needs one pair of socks and a shirt for home games and another pair of socks and a shirt for away games. If the total cost is $2366, how many members are in the League?

## Problem 3

A solid box is cm by cm by cm. A new solid is formed by removing a cube cm on a side from each corner of this box. What percent of the original volume is removed?

## Problem 4

It takes Mary minutes to walk uphill km from her home to school, but it takes her only minutes to walk from school to her home along the same route. What is her average speed, in km/hr, for the round trip?

## Problem 5

Let and denote the solutions of . What is the value of ?

## Problem 6

Define to be for all real numbers and . Which of the following statements is not true?

for all and

for all and

for all

for all

if

## Problem 7

How many non-congruent triangles with perimeter have integer side lengths?

## Problem 8

What is the probability that a randomly drawn positive factor of is less than ?

## Problem 9

Simplify

.

## Problem 10

The polygon enclosed by the solid lines in the figure consists of 4 congruent squares joined edge-to-edge. One more congruent square is attatched to an edge at one of the nine positions indicated. How many of the nine resulting polygons can be folded to form a cube with one face missing?

## Problem 11

The sum of the two 5-digit numbers and is . What is ?

## Problem 12

A point is randomly picked from inside the rectangle with vertices , , , and . What is the probability that ?

## Problem 13

The sum of three numbers is . The first is four times the sum of the other two. The second is seven times the third. What is the product of all three?

## Problem 14

Let be the largest integer that is the product of exactly 3 distinct prime numbers , , and , where and are single digits. What is the sum of the digits of ?

## Problem 15

What is the probability that an integer in the set is divisible by and not divisible by ?

## Problem 16

What is the units digit of ?

## Problem 17

The number of inches in the perimeter of an equilateral triangle equals the number of square inches in the area of its circumscribed circle. What is the radius, in inches, of the circle?

## Problem 18

What is the sum of the reciprocals of the roots of the equation

?

## Problem 19

A semicircle of diameter sits at the top of a semicircle of diameter , as shown. The shaded area inside the smaller semicircle and outside the larger semicircle is called a *lune*. Determine the area of this lune.

## Problem 20

A base-10 three digit number is selected at random. Which of the following is closest to the probability that the base-9 representation and the base-11 representation of are both three-digit numerals?

## Problem 21

Pat is to select six cookies from a tray containing only chocolate chip, oatmeal, and peanut butter cookies. There are at least six of each of these three kinds of cookies on the tray. How many different assortments of six cookies can be selected?

## Problem 22

In rectangle , we have , , is on with , is on with , line intersects line at , and is on line with . Find the length of .

## Problem 23

A large equilateral triangle is constructed by using toothpicks to create rows of small equilateral triangles. For example, in the figure we have rows of small congruent equilateral triangles, with small triangles in the base row. How many toothpicks would be needed to construct a large equilateral triangle if the base row of the triangle consists of small equilateral triangles?

## Problem 24

Sally has five red cards numbered through and four blue cards numbered through . She stacks the cards so that the colors alternate and so that the number on each red card divides evenly into the number on each neighboring blue card. What is the sum of the numbers on the middle three cards?

## Problem 25

Let be a -digit number, and let and be the quotient and the remainder, respectively, when is divided by . For how many values of is divisible by ?