Pre-Algebra

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help me calculate this - my 6th grade nephew has this question for homework and I'm at a loss.

The combined age of 2 people is 91. Person A is two times as old as Person B was when Person A was as old as Person B is now.

  • Pre-Algebra -

    My stab at it...
    A+B=91 (Combined age)
    A=2B
    B=91-A (Age of Person B now)

    Substituting:
    A=2(91-A) = 60.66 or 60 2/3
    60.66+B=91
    B=30.33 (or 30 1/3)

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