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6 grade math

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This Christmas,your brother Jack will be 2 years from being twice as old as your sister Jen.The sum of Jack's age and three times Jen's age is 66.How old is Jen?

  • 6 grade math -

    Let x be Jack's age.
    Let y be Jen's age.

    x = 2y - 2
    x + 3y = 66

    So:

    2y - 2 + 3y = 66
    5y - 2 = 66
    5y = 68
    y = 13.6.
    So she's about 13 and a half years old.

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