The acerage age of 8 members of a committee is 40 years. A member of 55 years age retires and a man of age 39 years becomes a new member. The average age of the new committee member is

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Solution

$Average age of 8 members = 40 years Sum of age of all 8 members = 8 \times 40 years = 320 years A member of 55 years age retires and a man of age 39 years becomes a new member . New sum of age of all 8 members = 320 - 55 + 39 = 304 years New average age of 8 members = \frac{304}{8} = 38 years$

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The acerage age of 8 members of a committee is 40 years. A member of 55 years age retires and a man of age 39 years becomes a new member. The average age of the new committee member is

Average age of 8 members=40 yearsSum of age of all 8 members=8×40 years=320 yearsA member of 55 years age retires and a man of age 39 years becomes a new member.New sum of age of all 8 members=320-55+39=304 yearsNew average age of 8 members=3048=38 years

$Average age of 8 members = 40 years Sum of age of all 8 members = 8 \times 40 years = 320 years A member of 55 years age retires and a man of age 39 years becomes a new member . New sum of age of all 8 members = 320 - 55 + 39 = 304 years New average age of 8 members = \frac{304}{8} = 38 years$