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A speaker was so boring that one-half of the audience left after a few minutes. Five minutes later, one-third of the remaining audience left. Ten minutes later, one-fourth of those remaining left, leaving only nine people in the audience. How many people were in the audience at the beginning of the lecture.

  • Math -

    x = people in audience
    1/2 x = left 1st
    1/3 (1/2 x) = 1/6 x = left next
    1/4 (1/3)(1/2)x = 1/24 x = left last

    x - (1/2 x + 1/6 x + 1/24 x) = 9

    Solve for x

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