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The average of 10 numbers is 20. If the average of first nine numbers is 21, what will be the value of the last number..

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Solution

The average of 10 numbers is 20.
Sum of 10 number will be 20×10 =200

The average of first 9 numbers is 21.
The sum of first 9 numbers is 21×9=189.

Last number will be 200-189 = 11

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