The average age of a family of 8 members is 23 years. If the age of the youngest membe be 7 years, then what was the average age of the family member at the birth of the youngest member ?
Solution: Total age of all members= 8 * 23 =184 years
7, years ago, total sum of ages= 184 - ( 8 * 7 ) = 128 years
But 7 years before there were only 7 members in the family so,
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