the average age of five members of a family is 24.if the present age of youngest member is 8 years,what was the average age of family at the time of birth of youngest member?
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The average age of five members of a family is=24
present age of youngest member is - 8
we know that
Average= sum of total no. of observation/no.of observation
=x+x+x+x+8/5=24
=4x+8=24×5
=sum of the age of a family=120(4x+8 is the total age of the family)
the average age of the family at the time of birth of youngest member,
age of the family at the time of birth of youngest member=120-8
=112 year's
Average=112/4
=28
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