The sum of ages of 5 children born at the intervals of 3 years each is 60 years. What is the age of the youngest child? Select.
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) = 60   5x = 30   x = 6.   Age of the youngest child = x = 6 years.   6 years)
<result>C</result>
The sum of ages of 5 children born at the intervals of 3 years each is 60 years. What is the age of the youngest child?