The average age of group of 15 boys is 15 years when 2 more boys joined the group the average of the group rouse by 2 years. Find the sum of the ages of extra 2 boys in years.
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The total age of 15 boys=15x15=225years
The total age of new set of 17 boys=17x17=289hears
Therefore, the sum of age of new two boys = 289-225=64years
The total age of new set of 17 boys=17x17=289hears
Therefore, the sum of age of new two boys = 289-225=64years
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