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how can i set this up via double set matrix? in a particular

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how can i set this up via double set matrix? in a particular [#permalink] New post 15 Feb 2008, 03:53
how can i set this up via double set matrix?

in a particular state, 70% of the counties received some rain on Monday and 65% of the counties received some rain on Tuesday. No rain fell either day in 25 percent of the counties in the state. What percent of the counties received some rain on Monday and Tuesday?
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Re: Double set matrix [#permalink] New post 15 Feb 2008, 04:51
100-25 = 70 + 65 - X => X = 60%

This is an overlapped set question
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Re: Double set matrix [#permalink] New post 15 Feb 2008, 05:41
my four columns in double set matrix are:

rain monday, no rain monday, rain tuesday, and no rain tuesday. used 100 countries as example to solve problem.

given that total for rain on monday=70, and total for rain on tuesday =65, and that no rain monday+no rain tuesday=25. fill in the blanks now :)

sorry i wasnt able to draw this out
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Re: Double set matrix [#permalink] New post 17 Feb 2008, 15:58
alright i figured it out. i wasnt able to think at 6 in the morning.


total = a + b - both + none
100 = 70 + 65 - x + 25
x=60
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Re: Double set matrix   [#permalink] 17 Feb 2008, 15:58
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