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The average of 8 numbers is 20. The aver...

The average of 8 numbers is 20. The average of first tow numbers is 15 `(1)/(2)` and that of the next three is `21 (1)/(3)`. If the sixth number be less that the seventh and eight numbers by 4 and 7 respectively, then the eighth number is :

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The correct Answer is:
`=25`
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