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word problem

by sud21 » Thu Jan 12, 2012 4:32 am
Students in the cafe, each either like tea or dislike tea, each either like coffee or dislike coffee. If 2/3 students dislike tea, and in those students dislike tea, 3/4 dislike coffee. How many students like coffee?
1). Total number of the students is 120
2). 40 students like tea
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Source: — Data Sufficiency |
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by sud21 » Sun Jan 29, 2012 10:52 pm
2/3 of 120 = 80 dislike tea. 3/4 of 80 = 60 dislike coffee.

St.(1) total is 120. From it we can get like coffee.Sufficient.

St.(2) 40 like tea. Nothing about coffee or total.Not sufficient.


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