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?
The correct option is C 10
Let C's age be x years. Then, B's age = 2x years. A's age = (2x + 2) years.
$$\therefore (2x + 2) + 2x + x = 27$$
$$\Rightarrow 5x = 25$$
$$\Rightarrow x = 5$$
Hence, B's age = 2x = 10 years