If one positive integer is greater than another positive integer by 3, and the difference of their cubes is 279, what is their sum? Options
A) 5
B) 7
C) 9
D) 11
E) 13
1^3 = 1   2^3 = 8   3^3 = 27   4^3 = 64   5^3 = 125   6^3 = 216   7^3 = 343   The two numbers are 4 and 7.   The answer is 11.
<result>D</result>
If one positive integer is greater than another positive integer by 3, and the difference of their cubes is 279, what is their sum?