# SAT Math Multiple Choice Practice Question 351: Answer and Explanation

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**Question: 351**

**21.** The volume of right cylinder *A* is twice the volume of right cylinder *B*. If the height of cylinder *B* is twice the height of cylinder *A*, then what is the ratio of the radius of cylinder *A* to the radius of cylinder *B*?

A. 1 to 2

B. 1 to 1

C.

D. 2 to 1

E. 4 to 1

**Correct Answer:** D

**Explanation:**

**D** The volume of a cylinder is equal to π*r*^{2}*h*. Let's say that the radius of cylinder A is *a* and the radius of cylinder B is *b*. Since the height of cylinder *B* is twice the height of cylinder *A*, if the height of cylinder A is *h*, then the height of cylinder B is 2*h*. The volume of