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When Professor Sum was asked by Mr. Little how many students were in his classes, he answered, “All of them study either languages, physics, or not at all. One-half of them study languages only, one-fourth of them study French, one-seventh of them study physics only, and 20 do not study at all.” How many students does Professor Sum have?

  • math -

    1/2 + 1/4 + 1/7 = X - 20

    Solve for X.

    I hope this helps.

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