The sum of ages of 5 children born at the intervals of 3 years each is 65 years. What is the age of the youngest child?	Choose the correct choice from the following
A) 3 years	B) 4 years	C) 6 years	D) 7 years	E) 8 years

Rationale: "let the ages of children be x , ( x + 3 ) , ( x + 6 ) , ( x + 9 ) and ( x + 12 ) years . then , x + ( x + 3 ) + ( x + 6 ) + ( x + 9 ) + ( x + 12 ) = 65 5 x = 35 x = 7 . age of the youngest child = x = 7 years . d )"
Answer: D