ISEE Word Problems Question 115: Answer and Explanation

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Question: 115

10. The set of common factors for 30 and 24 is

A. {1, 2, 3, 6}
B. {1, 2, 3, 4, 6}
C. {1, 2, 4, 6}
D. {1, 2, 4, 6, 12}

Correct Answer: A

Explanation:

The correct answer is (A). The set of factors for 24 is:

{1, 2, 3, 4, 6, 8, 12, 24}

The set of factors for 30 is:

{1, 2, 3, 5, 6, 10, 15, 30}

The set of common factors is:

{1, 2, 3, 6}