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Bingel [31]
3 years ago
6

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

Mathematics
1 answer:
Katena32 [7]3 years ago
4 0

-- 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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