the sum of the ages of 5 children born at the intervals of 3 year each is 50 year. what is the age of the youngest child ? Choose one.
A) 4 year
B) 8 year
C) 10 year
D) None of these
E) 9 year
Solution   let the ages of the children be x,(x + 3),(x + 6),(x + 9) and (x + 12) year.   then, x + (x + 3) + (x + 6) + (x + 9) + (x + 12) = 50 ⇔ 5 x = 20 ⇔ x= 4.   ∴ Age of the youngest child = x = 4 years. 4 yearnswer 4 year
<result>A</result>
the sum of the ages of 5 children born at the intervals of 3 year each is 50 year. what is the age of the youngest child ?