每日一题

Mathematics>Standard Multiple Choice

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

If x/y=3 and x=12, then x-y=

(A) 3
(B) 5
(C) 6
(D) 8
(E) 9

答案和解析

答案：D

解析：

Since x=12 and x/y=3, it follows that 12/y=3 and, therefore, y=4.So x-y=12-4=8.