The sum of ages of 5 children born at the intervals of 3 years each is 50 years. What is the age of the youngest child?
Choose the correct choice from the following
A) 4 B) 5 C) 9 D) 8 E) 10

Rationale: "the age of children x , ( x + 3 ) , ( x + 6 ) , ( x + 9 ) and ( x + 12 ) years . x + ( x + 3 ) + ( x + 6 ) + ( x + 9 ) + ( x + 12 ) = 50 5 x = 20 , x = 4 . correct answer ( a )"
Answer: A