Average of 10 numbers is 12 if avarage offirst 7 numbers is 7 then finds the average of last 3 numbers
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an example to do :The arithmetic mean of a set of 7 numbers is 20. It means the total of the 7 numbers is 7*20 = 140.
The arithmetic mean of a second set of 13 numbers is 40. It means the total of the 13 numbers is 13*40 = 520.
Therefore, the mean of all the 20 numbers is (140+520)/(7+13) = 660/20 = 33.
The answer is 33
hop it helps
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