the average of 10numbers is 65 if the average of first 9 numbers is 64 find the 10th number.
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sum of 10 no=65*10=650
sum of 9 no= 64*9=576
10th no=650-576=74
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Answer:
Sum of 10no.=65×10=650
Sum of 9no.=64×9=576
10th no.=650-576=74
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