The average age of the boys in a class of 20 boys is
15.6 years. What will be the average age if 5 new
boys come whose average age is 15-4 years?
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Step-by-step explanation:
Average of 20 boys = 15.6
Average of 5 new boys = 15.4
New average of 25 boys =
(15.6 x 20 + 15.4x5)/25
= 15.56 years
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