The average of eight numbers is 20. If the sum of first two numbers is 31. The average of the next three numbers is21{1}/3and the seventh and eighth numbers exceed the sixth number by 4 and 7 respectively, then the eighth number is

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The average of eight numbers is 20. If the sum of first two numbers is 31. The average of the next three numbers is21

and the seventh and eighth numbers exceed the sixth number by 4 and 7 respectively, then the eighth number is

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