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There were 36.000 hardback copies of a certain novel sold

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There were 36.000 hardback copies of a certain novel sold [#permalink] New post 12 Apr 2006, 03:25
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There were 36.000 hardback copies of a certain novel sold before the paperback version was issued. From the time the first paperback copy was sold until the last copy of the novel was sold. 9 times as many paperback copies as hardback copies were sold. If a total of 441.000 copies of the novel were sold in all, how many paperback copies were sold?

(A) 45.000
(B) 360.000
(C) 364.500
(D) 392.000
(E) 396.900
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 [#permalink] New post 12 Apr 2006, 04:18
C it is
9 times as many paperback copies as hardback copies were sold
X-hard copy than 9x-paperback
total 441000
so 10x=441000-36000
10x=405000
x=40500
total hard copies 40500+36000=76500
paper back=441000-76500=364500
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 [#permalink] New post 12 Apr 2006, 07:42
There seems to be a small twist to every question and I always seem to adopt the Joe Blog style, getting it wrong :x
I think, working on the Verbal section the last couple of weeks has really caught up on my Math. :wall

Anyway, C it is. (I didnt get it in the first go, though)
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 [#permalink] New post 12 Apr 2006, 08:30
Let H= hard back copies and P = paperback copies
We know that:
P = 9H
H + P = (441'000 - 36'000)

Substituting P in the second equation:

H + 9H =405'000
H = 40'500

Thus, P = 9 (40'500) or P = 364'500
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 [#permalink] New post 12 Apr 2006, 13:05
I got another answer . It's E - 396,900

Hardback copies sold 36000+x, where X sold after softback started to issued.
Softback = 9*(36000+x)
Total 9*(36000+x)+36000+x=441000
from that x=8100

Total hardback books sold = 36000+8100=44,110
Softback copies sold = 441000-44110=396,900
(check 41,100*9=396,900)
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 [#permalink] New post 12 Apr 2006, 14:16
Natalya Khimich wrote:
I got another answer . It's E - 396,900

Hardback copies sold 36000+x, where X sold after softback started to issued.
Softback = 9*(36000+x)
Total 9*(36000+x)+36000+x=441000
from that x=8100

Total hardback books sold = 36000+8100=44,110
Softback copies sold = 441000-44110=396,900
(check 41,100*9=396,900)


pay attention to this part of the question

From the time the first paperback copy was sold

therefore softback = 9 * x
  [#permalink] 12 Apr 2006, 14:16
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