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singlesmiles
singlesmiles singlesmiles
  • 15-10-2015
  • Mathematics
Answered

The average of 6 numbers is 7. When a 7th number is addedThe average of all numbers is 0. What is the seventh number?

Verified Answer :

AL2006
AL2006 AL2006
  • 15-10-2015


-- The average of 6 numbers is 7.
    So those 6 numbers must add up to 42.

-- If one more number results in an average of zero,
   the new number must be  -42 .
   Then all 7 numbers add up to zero.

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