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16 May, 03:50

Half of your baseball card collection got wet and was ruined. You bought 9 cards to replace some that were lost. How many did you begin with if you now have 20?

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  1. 16 May, 06:39
    0
    solution:

    n/2 + 9 = 20

    n/2=20-9

    n/2=11

    n=22
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