The sum of ages of 5 children born at the intervals of 3 years each is 80 years. What is the age of the youngest child?  Choose the most appropriate option:	A) 3 years	B) 4 years	C) 6 years	D) 7 years	E) 10 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 ) = 80 5 x = 50 x = 10 . age of the youngest child = x = 10 years . e )"
Answer: E