SAT Math Multiple Choice Practice Question 147: Answer and Explanation

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Question: 147

15.

Gasoline is being poured into a cylindrical container with a radius of 5 feet and a height of 6 feet. Originally, the gasoline was stored in the box-shaped container shown here. Roughly how many of these containers would be needed to fill the tank completely?

A. 8
B. 10
C. 12
D. 15
E. 20

Correct Answer: E

Explanation:

E. The original containers have a volume of 2 × 3 × 4 = 24 cubic feet. If you don't remember the volume of a cylinder, check out the reference table at the top of the Math section: V = πr2h = π(5)2(6) = 150π = about 471. Next, you just have to divide: 471 ÷ 24 = 19.6, or roughly 20.

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