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31 August, 15:11

Tom's and Tim's ages add up to 21 years. In 3 years, Tom will be twice Tim's age. How old are they now?

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  1. 31 August, 15:17
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    Let X = toms age

    let y = Tim's age

    X+y=21

    (X+3) = 2 (y+3)

    X+3=2y+6

    X-2y=3

    2 * (X+y=21) multiple the equation by 2

    so now you have 2 equations

    x-2y=3

    2x+2y=3

    add the equations (2y cancel out)

    3x=9

    solve for X and plug back into one of the original equations to get y
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