The average age of a family of 6 members is 28 years.If the age of the youngest member is 7 years,what was the average age of the family at the birth of the youngest member?	Choose the most appropriate option:  A) 15  B) 18  C) 21  D) 12  E) 19
Present age of total members = 6 X 28 = 168   7 yrs back their ages were = 6 x 7 = 42   Ages at the birth of youngest member = 168 - 42= 
<gadget id="calculator">168 - 42</gadget>
<output>126</output>
126   Therefore, avg age at the birth of youngest member= 126/6= 
<gadget id="calculator">126/6</gadget>
<output>21</output>
21.   ANSWER:21
<result>C</result>
The average age of a family of 6 members is 28 years.If the age of the youngest member is 7 years,what was the average age of the family at the birth of the youngest member?