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Source: — Data Sufficiency |
Junior | Next Rank: 30 Posts
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by ravikirancheni » Sun Dec 14, 2008 12:54 am
This is a beauty !!..

well,

ST-1

The total number of books sold on Thursday -- 8
That means it should be that number of books sold on friday would be more than 8, but it can be 10,11,12....so on...

So ST-1 is insufficient and divulges nothing.


ST-2

The total no.of books sold on saturday --> 38.
Remaining 52 books would be sold on the previous 5 days.

let us imagine that at max, 10 books are sold on each day from Monday to friday => 5x10 = 50 books ...

But it was said that Friday has the second highest sale , so the no.of books sold on friday would be greater than books sold on any other day.

How about remaining 2 books , these two books has to be on friday i,e total of 12 books are to be sold on friday.

OR

11 books cannot be sold on friday.(more than 11 has to sold to make friday second highest sales day)

Hope this helps.

So ST-2 is sufficient.

Nice post.
Thanks


Keep rocking !
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by ddo » Mon Dec 15, 2008 11:49 am
This is how I attacked this Q.

According 2, if 38 books were sold on Sat, 52 books must be sold in the 6 remaining days.

If 11 books were sold on Friday, as all the other days must be different and less than 11 the max we could have had are: 10+9+8+7+6 total 40 books + 11 from Friday = 51, but it should add 52 so Friday should be greater than 11
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