x, a, z, and b are single digit positive integers. x = 1/7 a. z = 1/7 b. (10a + b) – (10x + z) could NOT equal	Select the correct option:
A) 30	B) 36	C) 42	D) 63	E) 66
a=7x , b =7z therefore(7x.10+7z) - (10x +z) = (7-1) (10x+z) =6.(10x+Z)   number should be divisible by 6   63
<result>D</result>
x, a, z, and b are single digit positive integers. x = 1/7 a. z = 1/7 b. (10a + b) – (10x + z) could NOT equal