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if the total price for n copies of a book is $31.5, what is

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if the total price for n copies of a book is $31.5, what is [#permalink] New post 14 Jul 2008, 10:00
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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.
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Re: DS2 [#permalink] New post 14 Jul 2008, 10:38
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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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Re: DS2 [#permalink] New post 14 Jul 2008, 22:09
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, 22:09
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