The sum of 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 answer:
A) 8 years
B) 16 years
C) 4 years
D) 18 years
E) 12 years
Let the age of first child be x years.   since all the children got birth in interval of 3 years so the age of 2nd,3rd,4th and 5th child would be x-3 , (x-3)-3 ,((x-3)-3)-3 ,(((x-3)-3)-3)-3 respectively,   also the sum of ages of all children is 50,   = x+(x-3)+(x-6)+(x-9)+(x-12)=50   =5x-30=50   =5x=80   =x=16   so the age of youngest child would be   16-12= 
<gadget id="calculator">  16-12</gadget>
<output>4</output>
4 years. ANSWER : 4 years
<result>C</result>
The sum of ages of 5 children born at the intervals of 3 years each is 50 years. What is the age of the youngest child?