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11 copies on Friday

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11 copies on Friday

by sanju09 » Fri Apr 17, 2009 1:09 am
Store S sold a total of 90 copies of a certain book during the seven days of last week, and it sold different numbers 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 the 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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by lilu » Fri Apr 17, 2009 12:36 pm
https://www.beatthegmat.com/gmat-prep-qu ... 32439.html
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by cubicle_bound_misfit » Fri Apr 17, 2009 12:51 pm
The answer is clearly B.

let's start with stmt 2.
barring SATday store sold 90-38 books = 52 books now Friday can have at most 37 books.
there fore Sun-Thu can have 52-37 = 15 books.

We have to distribute 15 books over 5 days in a way that same no of books are not sold on any two days.

15 = 1+2+3+4+5 so yes Friday sales was >11

for stmt 1.
knowing only thursdays sales lead to multiple possibilities. hence INSUFF
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