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 one.
A) 3 years	B) 4 years	C) 6 years	D) 7 years	E) 8 years
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   5x = 35   x = 7.   Age of the youngest child = x = 7 years.   7 years)
<result>D</result>
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?