The sum of the ages of 5 children born at the intervals of 4 years each is 50 years. what is the age of the eldest child ?  Choose the correct choice:
A) 15
B) 8
C) 18
D) None of these
E) Cannot be determined
Explanation:   Let x = the youngest child. Each of the other four children will then be x+4, x+8, x+12, x+16.   We know that the sum of their ages is 50 .   so, x+(x+4)+(x+8)+(x+12)+(x+16) = 50   x= 2   The youngest child is 2 years old.   Age of eldest child is = 2+16= 
<gadget id="calculator">2+16</gadget>
<output>18</output>
18   Answer: 18
<result>C</result>
The sum of the ages of 5 children born at the intervals of 4 years each is 50 years. what is the age of the eldest child ?