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double matrix chart

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double matrix chart

by resilient » Thu Jun 19, 2008 7:14 pm
i need to attack this problem using the double matrix method. Any help? I dont do ven.
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doublematrix overlap question.jpg
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by durgesh79 » Thu Jun 19, 2008 8:42 pm
I dont know how to make matrix in text but I'll try

Only A Only B Both A anb B
Read X 500/2 500


Total who read A = X + 500
Total who read B = 500/2 + 500 = 750

As per question. X+500 = 2 * 750
X=1000
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by wawatan » Thu Jun 19, 2008 9:41 pm
the matrix is confusing...so i usually use the venn diagram

A= 2* B

read both A and B= 500

500= 2 * (read only B)

500/2= people who read only b= 250

read b= 250+500= 750

read A= 2 * 750= 1500

Read only A 1500-500= 1000
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gmat prep venn diag.JPG
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