What is the sum of two consecutive even numbers, the difference of whose squares is 84? Choose the correct answer:
A) 42
B) 84
C) 48
D) 24
E) 43
Let the numbers be x and x + 2.   Then, (x + 2)2 - x2 = 84   4x + 4 = 84   4x = 80   x = 20.   The required sum = x + (x + 2) = 2x + 2 + (  + 2)= 
<gadget id="calculator">+ (  + 2)</gadget>
<output>2</output>
2x + 2= 42.   42NSWER 42 42
<result>A</result>
What is the sum of two consecutive even numbers, the difference of whose squares is 84?