The sum of ages of 5 children born 3 years different each is 55 yrs. What is the age of the Elder child?
Options:  A) 17  B) 19  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) = 55   5x = 25   x = 5.   x+12= 5+12= 
<gadget id="calculator">5+12</gadget>
<output>17</output>
17   17
<result>A</result>
The sum of ages of 5 children born 3 years different each is 55 yrs. What is the age of the Elder child?