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 

正确答案>>>

The correct answer is D

Explanation

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