If the sum and difference of two numbers are 15 and 10 respectively, then the difference of their square is:	Choose the correct option.
A) 12  B) 150  C) 160  D) 180  E) 18

Rationale: "let the numbers be x and y . then , x + y = 15 and x - y = 10 x 2 - y 2 = ( x + y ) ( x - y ) = 15 * 10 = 150 . answer : b"
Answer: B