The positive number z is divisible by 4. What is the remainder of dividing z(2+4+z)+3 by 2? Answers:
A) 0
B) 1
C) 2
D) 3
E) 4

Rationale: when we solve any of these equations : 28 + 3 ( z = 4 ) or 56 + 3 ( z = 8 ) we end up with numbers to which we have to subtract 1 to end up with a number that is exactly divisible by 2 . this is why we know that every result we get is going to have 1 as a remainder . hence answer is b .
Answer: B