math-algebra

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There are 10 boxes,if 7 contain pens,3 contain pens and pencils,2 contain pencils only.how many empty boxes are there?

  • math-algebra -

    Make a Venn diagram of two intersectiong circles.
    Label one PENS and the other PENCILS
    put 3 in the intersection of both circles
    leaving 4 to go into the remaining part of circle PENS
    put 2 in the remaining part of PENCILS
    adding those numbers:
    4+3+2 give us 9 boxes with some kind of content
    leaving 1 box to be empty.

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