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1. 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 be 27, the how old is B?

Solution:
Let C's age be x years. Then, B's age = 2x years. A's age = (2x + 2) years.

∴ (2x + 2) + 2x + x = 27
⇒ 5x = 25
⇒ x = 5.
Hence, B's age = 2x = 10 years.

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