What is the sum of two consecutive even numbers, the difference of whose squares is 84?	Pick.
A) 42	B) 84	C) 48	D) 24	E) 43

Rationale: let the numbers be x and x + 2 . then , ( x + 2 ) 2 - x 2 = 84 4 x + 4 = 84 4 x = 80 x = 20 . the required sum = x + ( x + 2 ) = 2 x + 2 = 42 . answer a 42
Answer: A