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6 February, 07:24

Cristian has $20 in his bank account and is spending $2 everyday. Nathan has $2 in his account and saves $1 per day. Write 2 equations, and figure out when they will have the same amount of money.

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  1. 6 February, 10:41
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    Let x = days and let y = the bank account balance

    Cristian: 20-2x=y

    Nathan: 2+1x=y

    Set them equal to each other because they are both equal to y:

    20-2x=2+1x

    Move the - 2x and the 2 over

    3x=18

    Divide by 3

    x=6 days
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