What is the sum of two consecutive even numbers the difference of whose squares is 84

What is the sum of two consecutive even numbers the difference of whose squares is 84 Correct Answer 42

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 = 42.
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