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Math - age problem

One year ago Liz was 3 times as old as her brother Jack. In two years she'll only be twice as old as Jack. How old are Liz and Jack now?

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Amy

  1. L - 1 = 3(J - 1)

    L + 2 = 2(J +2) = 2J + 4

    L = 2J + 2

    Substitute 2J + 2 for L in the first equation and solve for J. Insert that value into the last equation to solve for L. Check by putting both values into the first equation.

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    PsyDAG

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