If one positive integer is greater than another positive integer by 3, and the difference of their cubes is 63, what is their sum?  Choose the correct option:	A) 5	B) 4	C) 3	D) 2	E) 1

Rationale: 1 ^ 3 = 1 2 ^ 3 = 8 3 ^ 3 = 27 4 ^ 3 = 64 the two numbers are 1 and 4 . the answer is a .
Answer: A