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A man buys 20 pens and 12 books for Rs. 320. He sells pens

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Intern
Joined: 29 Mar 2013
Posts: 17
Followers: 0

Kudos [?]: 11 [0], given: 12

A man buys 20 pens and 12 books for Rs. 320. He sells pens [#permalink]  02 Apr 2013, 12:05
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Question Stats:

50% (01:27) correct 50% (00:54) wrong based on 8 sessions
A man buys 20 pens and 12 books for Rs. 320. He sells pens at a profit of 40 % and books at a gain of 25 %. If his overall profit was Rs. 70, the cost price of the book is

A. 10
B. 12
C. 13
D. 15
E. None

[Reveal] Spoiler: OA

Last edited by Bunuel on 02 Apr 2013, 12:07, edited 1 time in total.
Renamed the topic and edited the question.
Manager
Joined: 24 Jan 2013
Posts: 81
Followers: 5

Kudos [?]: 94 [0], given: 6

Re: A man buys 20 pens and 12 books for Rs. 320. He sells pens [#permalink]  02 Apr 2013, 14:52
Are you sure this problem is well formulated?
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Intern
Joined: 29 Mar 2013
Posts: 17
Followers: 0

Kudos [?]: 11 [0], given: 12

Re: A man buys 20 pens and 12 books for Rs. 320. He sells pens [#permalink]  02 Apr 2013, 15:28
I found this one on some site,

This is what I was trying -
20x + 12y = 320
1.4*20x+1.25*12y=390

Do you think something's missing??

johnwesley wrote:
Are you sure this problem is well formulated?
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 5739
Location: Pune, India
Followers: 1444

Kudos [?]: 7579 [0], given: 186

Re: A man buys 20 pens and 12 books for Rs. 320. He sells pens [#permalink]  02 Apr 2013, 20:50
Expert's post
iwantto wrote:
A man buys 20 pens and 12 books for Rs. 320. He sells pens at a profit of 40 % and books at a gain of 25 %. If his overall profit was Rs. 70, the cost price of the book is

A. 10
B. 12
C. 13
D. 15
E. None

Overall profit = (70/320)*100 = 21.875%
This is less than the profit he made on pens as well as books which is not possible. There is something wrong with the numbers here.
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Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Intern Joined: 16 Jan 2013 Posts: 23 Followers: 0 Kudos [?]: 2 [0], given: 17 Re: A man buys 20 pens and 12 books for Rs. 320. He sells pens [#permalink] 04 Apr 2013, 06:38 iwantto wrote: A man buys 20 pens and 12 books for Rs. 320. He sells pens at a profit of 40 % and books at a gain of 25 %. If his overall profit was Rs. 70, the cost price of the book is A. 10 B. 12 C. 13 D. 15 E. None Please help!!! OA should be E bcoz Ps + Bs = 320 .....eq(1) 0.4Ps + 0.25Bs = 70 ....eq(2) solving we get, Bs = cost price of 12 books = 5800/15 so, cost price of a book = 5800/(15*12) = 1160/9 Re: A man buys 20 pens and 12 books for Rs. 320. He sells pens [#permalink] 04 Apr 2013, 06:38 Similar topics Replies Last post Similar Topics: 1 A man borrows Rs.360. If he pays it back in 12 monthly 3 09 Oct 2012, 00:15 11 A man cheats while buying as well as while selling. While 9 01 Jul 2012, 21:02 2 John buys koolaid for 12$ at a local store. If he bought it at the who 6 06 Apr 2011, 10:09
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