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4 February, 17:03

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

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  1. 4 February, 17:13
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    - - 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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