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# Of the books that are standing upright along the top shelf

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Manager
Joined: 02 Sep 2008
Posts: 102
Of the books that are standing upright along the top shelf  [#permalink]

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Updated on: 20 Apr 2009, 19:05
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Of the books that are standing upright along the top shelf of a bookcase, some are 1/2 inch thick and the rest are 3/4 inch thick. What is the total number of books standing upright along the top shelf ?

(1) Half of these books are 1/2 inch thick.
(2) The total thickness of all of these books is 25 inches.

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Originally posted by milind1979 on 18 Apr 2009, 20:52.
Last edited by milind1979 on 20 Apr 2009, 19:05, edited 1 time in total.
Manager
Joined: 22 Feb 2009
Posts: 129
Schools: Kellogg (R1 Dinged),Cornell (R2), Emory(Interview Scheduled), IESE (R1 Interviewed), ISB (Interviewed), LBS (R2), Vanderbilt (R3 Interviewed)

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19 Apr 2009, 10:55
Is there any typo in this question. Question is not clear
Manager
Joined: 19 Aug 2006
Posts: 225

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19 Apr 2009, 11:21
The way it reads now, it's E.
Manager
Joined: 05 Jul 2008
Posts: 131
GMAT 2: 740 Q51 V38

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23 Apr 2009, 04:41
milind1979 wrote:
Of the books that are standing upright along the top shelf of a bookcase, some are 1/2 inch thick and the rest are 3/4 inch thick. What is the total number of books standing upright along the top shelf ?

(1) Half of these books are 1/2 inch thick.
(2) The total thickness of all of these books is 25 inches.

A, B is not sufficient.
C:
(1) number of 1/2 inch thick books = number of 3/4 inch thick books = x
(2): 1/2 x + 3/4 x=25 => 5/4x=25....
C for me
Manager
Joined: 19 Oct 2008
Posts: 87

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23 Apr 2009, 11:14
Let x be the number of books 1/2 inch thick and let y be the number of books 3/4 inch thick, question is x+y=?

1) x=(x+y)/2 NS
2) .5x +.75y= 25 NS

Combining the two you can find value of x and y and hence value of x+y. Therefore C.
Manager
Joined: 19 Aug 2006
Posts: 225

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23 Apr 2009, 11:25
I think the original post got changed?
Anyway, I can see it's C now.

Good one, thanks!

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This is not a quality discussion. It has been retired.

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Re: Thickness of book... &nbs [#permalink] 23 Apr 2009, 11:25
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