# SAT Math Multiple Choice Practice Question 335: Answer and Explanation

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**Question: 335**

**5.** The radius of circle *A* is twice the radius of circle *B*. If the sum of their circumferences is 36π, then what is the radius of circle *A*?

A. 9

B. 12

C. 14

D. 16

E. 18

**Correct Answer:** B

**Explanation:**

**B** Let the radius of circle and the radius of circle . It is given that . The circumference of a circle can be found with the equation . The sum of their circumferences is 36π: