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I noticed that for some reason or another I have

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I noticed that for some reason or another I have [#permalink]  12 Jul 2008, 07:35
I noticed that for some reason or another I have difficulties with this kind of questions. You know, intersecting sets type of questions. "85% like apples, 65% like oranges, 10% don't like any of the fruits etc".

I am sure many were discussed here - is there an easy way to find them as a group? I want to spend a few hours practicing only this type of questions.
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Re: Sets / Venn diagrams questions [#permalink]  12 Jul 2008, 10:04
Expert's post
My method: how can we transform sum (85%+65%+10%=160%) to 100%? We need exclude double counting. In this case we need to exclude group that like both apples and oranges, because members of this group is counted twice.

160%-x=100% --> x=60% - both, 25% only apples, 5% only oranges, 10% - nothing.
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Re: Sets / Venn diagrams questions [#permalink]  12 Jul 2008, 11:52
Try this link. It's to purplemath.com. Odd domain name, but the site seems to have some great explanations as to how to do these types of problems, and they're not even a GMAT-focused website.

http://www.purplemath.com/modules/venndiag.htm

Here are 4 or 5 more problems:

http://www.regentsprep.org/Regents/math ... acVenn.htm

More:

http://www.math.tamu.edu/~kahlig/venn/venn.html

From the University of Georgia:

http://www.ai.uga.edu/~bancroft/venn/

4 problems in a Word Document:

http://math.gmu.edu/~pgranfie/Math%2010 ... %20S08.doc

The Holy Grail: It's a list of bunches of website URLs that can give you more practice with Venn Diagrams.

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Re: Sets / Venn diagrams questions   [#permalink] 12 Jul 2008, 11:52
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