Which of the following is the sum of two positive integers whose product is 36?

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问题 Which of the following is the sum of two positive integers whose product is 36?

选项 A、1
B、11
C、15
D、17
E、19

答案C

解析 The correct answer is C. To solve this problem, consider the pairs of positive integers whose product is 36:1 and 36; 2 and 24; 3 and 12; 4 and 9; and 6 and 6. The only pair whose sum is an answer choice is 3 + 12, or 15.
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