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15 December, 09:46

Susan began counting backwards from 1298 by 4's saying one number every 5 seconds. At the same time Jim begins counting forward from 171 by 3's saying one number every 5 seconds what number will they both say at the same time

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  1. 15 December, 12:45
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    1298 - 4x = 171 + 3x

    Add 4x to both sides

    1298 = 171 + 7x

    Subtract 171 from both sides

    1127 = 7x

    Divide by 7 on both sides

    x = 161

    They will both say the number 161 at the same time.
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