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17 August, 20:19

Here are five number cards. 2,5,7,8,9. One of the cards is removed and the mean average of the remaining four number cards is 6

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  1. 17 August, 22:44
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    7

    Step-by-step explanation:

    Given that there are 5 number cards.

    They are 2,5,7,8,9

    Total of all numbers in the cards = 2+5+7+8+9 = 31

    One card is removed say with number x.

    Now sum new would be = 31-x ... i

    Average of remaining 4 cards = 6

    So sum of remaining 4 cards = 6 (4) = 24 ... ii

    i and ii represent the sum of remaining 4 cards. Hence they should be equal

    31-x = 24

    Subtract 31 from both sides to get

    -x=-7

    Or x = 7
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