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Find the ages of John and Mary if four times John's age equals three times Mary's age, and Mary is ten years older than John.

  • Math -

    M = J + 10

    4J = 3M

    Substitute J+10 for M in second equation and solve for J. Insert that value into the first equation and solve for M. Check by inserting both values into the second equation.

  • Math -

    J= 120
    M= 130

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