If x + 3 is a multiple of 3, which of the

following is not a multiple of 3?

(A) x

(B) x + 6

(C) 6x + 18

(D) 2x + 6

(E) 3x + 5

The answer is E because if x+3=0 then x=-1 which is the multiple of 3x-1

1) x

we have x so its - 3

2) x+6

-3+6=3 its a multiple of 3 (3x1)

3) 6x+18

6 (-3) + 18

0 is a multiple of 3 (3x0)

4) 2x+6

2 (-3) + 6

0 is a multiple of 3

5) 3x+5

3 (-3) + 5

-1 is not a multiple of 3