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17 December, 19:21

The average of six numbers is 4. a seventh number is added and the new average is 5. what is the seventh number?

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  1. 17 December, 19:36
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    The average of 6 numbers is 4 ...

    t/6 = 4 ... t = 24 (the total of the 6 numbers)

    (24 + x) / 7 = 5

    24 + x = 35

    x = 35 - 24

    x = 11 < = = ur 7th number
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