Math

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In a survey of 50 students, 23 owned cellular phones, 18 ownded digital cameras, X owned cellular phones and digital camera, 2X owned neither.
a) How do i write an expression in X for the Total number of students in the survey and how do i find for X????

  • Math -

    23-X owned digital camers ONLY
    18-X owned a cell phone ONLY
    X owned both
    2X owned neither.
    Those are the only four possibilities, so the sum must equal 50.
    41 - 2X +X +2X = 50
    41 +X = 50
    X = 9

  • Math -

    how to represent this in a venn diagram
    in a survey of 50 students , 23 owned cellular phones, 18 owned digital cameras, x owned cellular phones and digital cameras,2x owned neither

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