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the average age of 9 boys in a class is 15years,if another boy of age 13years join the class, what is the average age of the 10boys​
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the average age of 9 boys in a class is 15years,if another boy of age 13years join the class, what is the average age of the 10boys​

User Tiago Espinha
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11 I think so if I’m wrong srry :(
User Sanket Berde
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