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?
Pick
A) None of these	B) 11 years	C) 10 years	D) 8 years	E) 4 years
Explanation:   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) = 50   ⇒ 5x = 20   ⇒ x = 4.   Age of the youngest child = x = 4 years.   Answer: 4 years
<result>E</result>
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?