The sum of the ages of 5 children born at the intervals of 3 year each is 60 year. what is the age of the eldest child ? Choose the correct option:
A) 4 year B) 18 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) = 60 â‡” 5 x = 30 â‡” x= 6.   âˆ´ Age of the eldest child = x +12= 6 +12= 
<gadget id="calculator">6 +12</gadget>
<output>18</output>
18 years. Answer 18 year
<result>B</result>
The sum of the ages of 5 children born at the intervals of 3 year each is 60 year. what is the age of the eldest child ?