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8 April, 21:54

Jim adds 20 to it, then doubles it and gets an answer of 99.2. What was the original number?

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  1. 9 April, 01:25
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    (n+20) * 2 = 99.2

    distribute

    2n + 40 = 99.2

    subtract 40 from each side

    2n = 59.2

    divide each side by 2

    n = 29.6
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