Math

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Mark is 11 years older than his sister. In 8 years he will be twice as old as she will be then. How old are they now?

  • Math -

    M = S+11
    M+8 = 2*(S+8) = 2*S + 16
    Now solve
    M = 2S+8
    2S+8 = S+11
    S = 3
    M = 14

  • Math -

    T=25+R
    R=25-5=20
    20+25=45
    T=45
    R=20

  • Math -

    Bob is 8 years older than his sister. 3 years ago he was 3 times older than his sister. How old are they both?

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