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# if the total price for n copies of a book is $31.5, what is  post reply Question banks Downloads My Bookmarks Reviews Important topics Author Message Intern Joined: 18 Dec 2006 Posts: 39 Followers: 0 Kudos [?]: 16 [0], given: 0 if the total price for n copies of a book is$31.5, what is [#permalink]

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14 Jul 2008, 11:00
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if the total price for n copies of a book is $31.5, what is the per copy of the book? 1) if twice as many copies were bought for same total price, the price per copy would be 1,75$
2) if 4 fewer copies were bought for the samt total price, the price per copy would be $2.80 greater. VP Joined: 09 Jul 2007 Posts: 1104 Location: London Followers: 6 Kudos [?]: 100 [1] , given: 0 Re: DS2 [#permalink] ### Show Tags 14 Jul 2008, 11:38 1 This post received KUDOS x=price per copy n*x=31.5 1. 2n*1.75=31.5 n=9 suff. 2. (n-4)*(x+2.8)=31.5 now it is all about system of equations, you should solve it for n-the number of books bought. suff. so D for me Zaur wrote: if the total price for n copies of a book is$31.5, what is the per copy of the book?
1) if twice as many copies were bought for same total price, the price per copy would be 1,75$2) if 4 fewer copies were bought for the samt total price, the price per copy would be$2.80 greater.
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14 Jul 2008, 23:09
1. 1.75= 31.5/2n solving whic we get n=9
2. we get 2 eqn
31.5/n=price per copy(p)
31.5/(n-4)= p+2.80
so replacing P we get get eqn with one variable and hence can solve the eqn to get the ans
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Re: DS2   [#permalink] 14 Jul 2008, 23:09
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