The average age of a family of 6 members is 22 yrs if the age of youngest member be 7 yrs , then what was the average age of family at birth of youngest member
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Total age of 6 members: 6x22=132
6 years ago the total age=132-42 = 90
Average of 5members=90/5=18
Average age of family at birth of
youngest member is l8
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