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 47, the how old is B?
Choose the most appropriate option.
A) 7
B) 9
C) 18
D) 11
E) 10
Explanation:   Let C's age be x years. Then, B's age = 2x years. A's age = (2x + 2) years.   (2x + 2) + 2x + x = 47   ⇒ 5x = 45   ⇒ x = 9.   Hence, B's age = 2x = 18 years.   Answer: 18
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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 47, the how old is B?