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21 March, 15:44

Alex and Benny had 440 cards. Alex and Cruz had 320 cards. Benny had 3 times as many cards as Cruz. How many cards did Alex have?

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  1. 21 March, 19:09
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    260 cards.

    Process:

    A = Alex

    B = Benny

    C = Cruz

    a+b=440

    a+c=320

    a=440-b

    a=320-c

    a=440-b=320-c

    b=3c

    a=440 - (3c) = 320-c

    -3c+440 = - c+320

    -3c=-c-120

    -2c=-120

    c=60

    a=320-c

    a=320-60

    a=260
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