A is two years older than B, who is twice as old as C. If the total of the ages of A, B, and C is 27, then how old is B?

Correct answer: 10

Solution

Let C = x. Then B = 2x and A = 2x + 2. Their sum is (2x + 2) + 2x + x = 27, so 5x + 2 = 27 and x = 5. Therefore B = 2x = 10.

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