Question

Assume that there are four families in a country.the average per capita income of these families is 10000.of the income of three family is 8000 14000 and 6000.find income of fourth family

Answer 1

let fourth family income be x.
then  (8000+14000+6000+x)/4= 10000
now 28000+x=40000
x= 40000-28000
x=12000.
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