x, a, z, and b are single digit positive integers. x = ¼ a. z = ¼ b.2*( (10a + b) – (10x + z) )could NOT equal
Choose the correct choice from the following answers:
A) 66
B) 72
C) 48
D) 126
E) 132
1) firstly we are not given that all are different integers..   2) since each is a positive single digit integer and x=a/4... a can take only 4 and 8 as value, and x can take 1 and 2..   3) same as 2) for b and z.   so in 2*((10a + b) – (10x + z)) ..   10a+b can be   44,48,84,88..   10x+z can be   11,12,21,22..   lets see teh choices   ans 48
<result>C</result>
x, a, z, and b are single digit positive integers. x = ¼ a. z = ¼ b.2*( (10a + b) – (10x + z) )could NOT equal