If C's age is twice the average age of A, B and C, A's age is one half the average of A, B and C. If B is 5 years old, the average age of A, B and C is?

10 years
15 years
12 years
9 years

Correct Answer: 10 years

Explanation:

Let the average age of A, B and C be N years.
∴ Total age of A, B and C = 3 x N = 3N years
Now, according to the question,
∵ 3N - (2N + N/2) = 5
∴ N = 10 years.

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