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?
The correct option is (D) 10.
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.