2016 AMC 10A Problem 5

Attempt Problem 5 of the 2016 AMC 10A below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2016 AMC 10A solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

A rectangular box has integer side lengths in the ratio $1:3:4.$ Which of the following could be the volume of the box?

$48$

$56$

$64$

$96$

$144$

Answer: D

Concepts:volume ratio and proportion

Difficulty rating: 900

Solution:

Let $s$ be the side length of the smallest side. Then the other two sides are $3s$ and $4s.$

The volume is therefore $s \cdot 3s \cdot 4s = 12s^3.$ Testing out values of $s,$ we see that if $s = 2,$ then $12s^3 = 96,$ which is an answer choice.

Thus, the correct answer is D .

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