If C's age is twice the average age of A, B and C, A's age

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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 ?

1. 10 years
2. 15 years
3. 12 years
4. 9 years

Correct Option: A

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.