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A certain novel is available in hardcover and paperback. If

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A certain novel is available in hardcover and paperback. If [#permalink] New post 19 Dec 2004, 18:23
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20. A certain novel is available in hardcover and paperback. If the store stocks a total of 100 copies of this book, how many are paperbacks?
(1) If 20 hardcover versions of this book were sold, there would be three times as many hardcover versions of the book remaining as paperback versions of the book remaining.
(2) If the hardcover version of the book cost twice as much as the paperback version of the book, the total sales of all the books in stock would yield $90

I know that (1) is sufficient but I do no understand why (2) is insufficient
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 [#permalink] New post 19 Dec 2004, 18:24
Hi, please post at most 10 questions at a time so as not to flood the forum and to give everyone the time to answer your questions. Thank you in advance.
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 [#permalink] New post 21 Dec 2004, 07:23
The answer is A
I'll explain you why (2) is insufficient
let x- the cost of paperback book
2x-hardcover
y-paperback books, 100-y-handcover
then you have one equation and two unknown
xy+2x(100-y)=90
How can you find the solution? :)

Last edited by lovely_baby on 21 Dec 2004, 07:24, edited 1 time in total.
  [#permalink] 21 Dec 2004, 07:23
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