The average age of 12 boys is 10 years .if the average of 11 boys is 9 years what will be the age of 12th boy
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average of 12 boys=
total age of 12 boys/ total boys
according to question ::--
total age of 12 boys = 12 × 10 = 120
total age of 11 boys = 11 × 9 = 99
we can write total age of 12 boys =
(age of 11 boys + age of 12th boy)
120 = 99 + age of 12th boy
age of 12th boy = 21
hope it helps
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