每日一题

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 3n is divided by 5?

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

答案和解析

答案：A

解析：

Choice (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, 3n is also a multiple of 5, and so the remainder when 3n is divided by 5 is likewise 0.