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11 December, 13:39

The average of 5 numbers is 80. If one number is removed, the average become 50. Find the removed number?

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  1. 11 December, 17:06
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    X / 5 = 80

    x = 80 * 5

    x = 400 ... so the total of the numbers added was 400

    (400 - x) / 4 = 50

    400 - x = 50 * 4

    400 - x = 200

    -x = 200 - 400

    -x = - 200

    x = 200 < = = the removed number
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