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Rodney is 3 times as old as his sister. A year ago, he was 4 times as old. How old are Rodney and his sister now?

  • math -

    s = sister's age now
    3s = Rodney's age now

    s-1 = sister's age a year ago
    3s-1 = Rodney's age a year ago
    so
    3s-1 = 4 (s-1)
    3s - 1 = 4s - 4
    I think you can take it from there.

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