The average age group of 10 friends is 10 years .If one of the friend leaves the group but at place another friend whose age is 22 years joins the group ,the average age becomes 8 years.Find the age of friends who left the group......?
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Total age of 10 frinds =10x10
=100
After left one friend then no of friends
=9
After join one friend age is 22 then no of friends =10
And averages of 10 friends become= 8
Total age of 10 friends
=10x8
=80
Age of 9 friends
= 10 Friends - 1 friend
=80 - 22
=58
Age of frindes who left
=100-58
=42
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