Question
A 15-member group has two individuals aged 18 and 23.
When excluded, the average age of the rest increases by 3 years. Find the average age of all members.Solution
ATQ, Average age 'u' years. Total age 15u. Sum age 18+23=41. Remaining 15uā41. New average u+3. Equation: 15uā41=13(u+3) Solve:Ā 15uā13u=41+39 ā80ā2u=80 āu=40
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