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Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

When the positive integer n is divided by 5, the remainder is 0. What is the remainder when 3 times n is divided by 5?

(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

答案和解析

答案：A

解析：

hoice (A) is correct. When the positive integer n is divided by 5, the remainder is 0. It follows that n is a multiple of 5. Therefore, 3 times n is also a multiple of 5, and so the remainder when 3 times n is divided by 5 is likewise 0.