If 3x+y=40, 2x-y=20, for integers of x and y, 3y^2=?
Options
A) 2
B) 48
C) 0
D) 10
E) 3

Rationale: 3 x + y = 40 2 x - y = 20 5 x = 60 x = 12 y = 4 3 y ^ 2 = 3 * 16 = 48 answer is b
Answer: B