If 4x larger than the sum x & 3y by 9, then x is larger than y by how much?
A
3
B
6
C
9
D
12
Correct Answer: 3
Here, 4x = x + 3y + 9 or, 4x - x - 3y = 9 or, 3x - 3y = 9 or, 3(x - y) = 9 or, x - y = 9/3 = 3