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by rajesh_ctm » Mon Apr 16, 2007 7:42 pm
Store S sold a total of 90 copies of a certain book during the seven days of last week, and it sold different number of copies on any two of the days. If for the seven days Store S sold the greatest number of copies on Saturday, and the second greatest number of copies on Friday, did Store S sell more than 11 copies on Friday?

(1) Last week Store S sold 8 copies of the book on Thursday.

(2) Last week Store S sold 38 copies of the book on Saturday.
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Source: — Data Sufficiency |
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Re: GMATPrep Question

by jayhawk2001 » Mon Apr 16, 2007 8:49 pm
rajesh_ctm wrote:Store S sold a total of 90 copies of a certain book during the seven days of last week, and it sold different number of copies on any two of the days. If for the seven days Store S sold the greatest number of copies on Saturday, and the second greatest number of copies on Friday, did Store S sell more than 11 copies on Friday?

(1) Last week Store S sold 8 copies of the book on Thursday.

(2) Last week Store S sold 38 copies of the book on Saturday.
Is it B ?

2 tells us that saturday = 38. If we assume 11 copies on friday,
the rest of the days should have sold a combined of 90 - 49 = 41
books.

Now, we know that Friday is the day of the second highest sale. So,
all others numbers have to be less than 11 and each number has to be
unique.

Taking the highest possible values down from 11, we get
10 + 9 + 8 + 7 + 6 = 40 books which is 1 short of our target of 41
books.

So, this means friday has to be > 11. Hence sufficient.

1 tells us nothing. We can plug in different values for friday and change
saturday accordingly. So insufficient.
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by rajesh_ctm » Tue Apr 17, 2007 4:32 am
Yes, it is B. Thanks for the explanation.
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