The sume of the ages of 5 children born at the intervals of 3 years each is 50 years.What is the age of the youngest child ?	Choose the correct choice:
A) 4 years
B) 8 years
C) 10 years
D) None of these
E) 11 years
Solution   Let the ages of the 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. 4 yearsnswer 4 years
<result>A</result>
The sume of the ages of 5 children born at the intervals of 3 years each is 50 years.What is the age of the youngest child ?