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There were 36000 copies of hardback sold before the

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There were 36000 copies of hardback sold before the [#permalink] New post 20 Mar 2006, 17:49
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There were 36000 copies of hardback sold before the paperback was introduced. From the time the first paperback copy was sold, until the last copy of th enovel was sold 9 times as many paperbacks copies as hardback copies were sold/ If a total of 441.000copies of the novel were sold in all, how many paperback copies were sold?

a. 45000
b 360000
c 364500
d. 392000
e 396900
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 [#permalink] New post 20 Mar 2006, 18:52
copies after start of paperback printing = 441000 - 36000 = 405000

x = # of hardcopy
9x + x = 405000
x=40500

# of paperback = 40500 * 9 =364500
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 [#permalink] New post 20 Mar 2006, 19:46
# of hardback copies sold after the first paperback copy sold = x
# of paperback copies sold = 9x

Total number of copies sold = 36,000 + 10x = 441,000
x = 40,500

# of paper copies sold = 364,500
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 [#permalink] New post 21 Mar 2006, 03:00
ywilfred wrote:
# of hardback copies sold after the first paperback copy sold = x
# of paperback copies sold = 9x

Total number of copies sold = 36,000 + 10x = 441,000
x = 40,500

# of paper copies sold = 364,500


o my.. i see my mistake .. the reason why i couldn't get the answer was from a substraction mistake in the beginning.

thanks.
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  [#permalink] 21 Mar 2006, 03:00
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