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

The average of 8 numbers is 20. The average of first two numbers is `15 1/2` and that of the next three is `21 1/3` . If the sixth number be less than the seventh and eighth numbers by 4 and 7 respectively, then the eighth number is: (a) 18 (b) 22 (c) 25 (d) 27

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RS AGGARWAL-AVERAGE-All Questions
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