.A mother has seven children. The mean age of the children is 13 years 2 months. If the mother’s age is included, the mean age rises to 17 years 7 months. Calculate the age of mother.
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total age of children= 13×7 2×7
= 92 years 2 month
total age of all members = 17×8 7×8
= 140 years 8 months
age of mother = 140-92 years 8-2 months
= 48 years 6 months
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