The average age of family of five members is 22 years . if the age of youngest is 10 years . the average age of family prior to the birth of youngest member is
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total age = 22x5 = 110
age without youngest member = 110-10=100
avg. age of other members = 100/4=25
so avg. age 10 years back =25-10=15
age without youngest member = 110-10=100
avg. age of other members = 100/4=25
so avg. age 10 years back =25-10=15
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