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, then how old is B?

7 years 8 years 9 years 10 years

10 years

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