five years ago mean age of a family was 25 years.what is the present mean age of the family
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let the present mean age be x
five years ago ,the mean age is x-5 whic is equal to 25
x-5=25
x=25+5
= 30
five years ago ,the mean age is x-5 whic is equal to 25
x-5=25
x=25+5
= 30
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