If x+y=2 and x2y3 + y2x3=32, what is the value of xy?  Choose one:
A) 1
B) 2
C) 3
D) 4
E) 5

Rationale: "xy = 4 as x + y = 2 x 2 y 3 + y 2 x 3 = 32 x 2 y 2 ( y + x ) = 32 substituting x + y x 2 y 2 = 16 xy = 4 answer : d"
Answer: D