Difference between revisions of "2022 AMC 8 Problems/Problem 15"
(→Solution 3) |
(→Solution 3) |
||
Line 221: | Line 221: | ||
</asy> | </asy> | ||
− | The red dot has a price per pound of something that is larger than <math>1</math>. The green dot has a price per pound of <math>1</math>. The blue dot has a price per pound of something like <math>\frac{2.5}{3}</math>. The orange dot has a price per pound that is less than <math>1</math>, but close to it. The purple dot has a price per pound of something like <math>\frac{4.5}{5}</math>. We see that choices <math>\textbf{(A)}</math>, <math>\textbf{(B)}</math>,and <math>\textbf{(D)}</math> are eliminated. Also, <math>\frac{4.5}{5} > \frac{2.5}{3}</math> thus our answer is <math>\boxed{\textbf{(C)} 3}</math> | + | The red dot has a price per pound of something that is larger than <math>1</math>. The green dot has a price per pound of <math>1</math>. The blue dot has a price per pound of something like <math>\frac{2.5}{3}</math>. The orange dot has a price per pound that is less than <math>1</math>, but close to it. The purple dot has a price per pound of something like <math>\frac{4.5}{5}</math>. We see that choices <math>\textbf{(A)}</math>, <math>\textbf{(B)}</math>,and <math>\textbf{(D)}</math> are eliminated. Also, <math>\frac{4.5}{5} > \frac{2.5}{3}</math> thus our answer is <math>\boxed{\textbf{(C) } 3}</math> |
==Video Solution== | ==Video Solution== |
Revision as of 21:09, 7 April 2022
Problem
Laszlo went online to shop for black pepper and found thirty different black pepper options varying in weight and price, shown in the scatter plot below. In ounces, what is the weight of the pepper that offers the lowest price per ounce?
Solution
We are looking for a black point, that when connected to the origin, yields the lowest slope. The slope represents the price per ounce. It is clearly the blue point, which can be found visually. Also, it is the only one with a price per once significantly less than . Finally, we see that the blue point is over the category with a weight of
ounces.
~MathFun1000
Solution 2 (Elimination)
By the answer choices, we can disregard the points that do not have integer weights. As a result, we obtain the following diagram:
We then proceed in the same way that we had done in Solution 1. Following the steps, we figure out the blue dot that yields the lowest slope, along with passing the origin. We then can look at the x-axis(in this situation, the weight) and figure out it has ounces.
~DairyQueenXD (edited by HW73)
Solution 3
We can find the lowest point in each line (,
,
,
, or
) and find the price per pound.
The red dot has a price per pound of something that is larger than . The green dot has a price per pound of
. The blue dot has a price per pound of something like
. The orange dot has a price per pound that is less than
, but close to it. The purple dot has a price per pound of something like
. We see that choices
,
,and
are eliminated. Also,
thus our answer is
Video Solution
https://youtu.be/Ij9pAy6tQSg?t=1305
~Interstigation
See Also
2022 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 14 |
Followed by Problem 16 | |
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 |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.