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math

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paulina gets on an elevator. at the first stop, 4 people get off and 3 get on. at the second stop, 5 people get off and one gets on. at the third stop, paulina gets off. if 4 people are still in the elevator when paulina gets off, how many people were on the elevator when she got on?

  • math -

    Let x = number of people when she got on.
    x -4+3 -5+1 -1 = 4
    x -6 = 4
    Solve for x to get x=10.
    So there were 10 people when Paulina got on (including herself).

  • math -

    the question was how many people were on the elevator when she got on?

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