The sum of ages of 5 children born at the intervals of three years each is 50 years what is the age of the youngest child?

A 4 years
B 8 years
C 9 years
D None of these

Correct Answer: 4 years

Let ages of children are x, X + 3, X + 6, X + 9, X + 12 respectively. Now, X + X + 3 + X + 6 + X + 9 + X + 12 = 50 5X + 30 = 50 5X = 20 X = 4 Age of the youngest child is 4 years.
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