The sum of ages of 5 children born 3 years different each is 75 yrs. What is the age of the Elder child?
Choose the correct choice from the following.
A) 7
B) 9
C) 16
D) 18
E) 21
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) = 75   5x = 45   x = 9.   x+12= 9+12= 
<gadget id="calculator">9+12</gadget>
<output>21</output>
21   21
<result>E</result>
The sum of ages of 5 children born 3 years different each is 75 yrs. What is the age of the Elder child?