x, a, z, and b are single digit positive integers. x = 1/6 a. z = 1/6 b. (10a + b) – (10x + z) could NOT equal	Pick.
A) 35
B) 30
C) 43
D) 60
E) 65

Rationale: "a = 6 x , b = 6 z therefore ( 6 x . 10 + 6 z ) - ( 10 x + z ) = ( 6 - 1 ) ( 10 x + z ) = 5 . ( 10 x + z ) number should be divisible by 5 c"
Answer: C