SAT Math Multiple Choice Practice Question 312: Answer and Explanation

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Question: 312

4. Any positive integer that is divisible by 6 and 15 must also be divisible by

A. 12
B. 21
C. 30
D. 72
E. 90

Correct Answer: C

Explanation:

C Find the smallest number that is divisible by both 15 and 6 and see which answer choice works.

Multiples of 15: 15, 30, 45, …

Multiples of 6: 6, 12, 18, 24, 30, …

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