The average age of 3 friends is 32 years. If the age of a fourth friend is added, their average age comes to 31 years.
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let the sum of the age of 3friends be z
z/3=32
z=96
let the age of 4th friend be x
x+96/4=31
x+96=124
x=28
z/3=32
z=96
let the age of 4th friend be x
x+96/4=31
x+96=124
x=28
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