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Q:

The average of 8 numbers is 20. The average of first two numbers is $$15{1\over2}$$ and that of the next three is $$21{1\over3}$$  . If the sixth number be less than the seventh and eighth numbers by 4 and 7 respectively, then the eighth number is :

  • 1
    25
  • 2
    27
  • 3
    18
  • 4
    22
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Answer : 1. "25 "

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