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A certain business printer can print 40 characters per

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VP
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A certain business printer can print 40 characters per [#permalink] New post 23 Aug 2007, 16:33
A certain business printer can print 40 characters per second, which is 4 times as fast as an average printer. If an average printer can print 5 times as fast as an electric typewriter, how many characters per minute can an electric typewriter print?

I got 2 but OA says 120

what do you think?
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Re: printers [#permalink] New post 23 Aug 2007, 17:38
Ravshonbek wrote:
A certain business printer can print 40 characters per second, which is 4 times as fast as an average printer. If an average printer can print 5 times as fast as an electric typewriter, how many characters per minute can an electric typewriter print?

I got 2 but OA says 120

what do you think?


per second = 2
per minuet = 60x2 = 120
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 [#permalink] New post 23 Aug 2007, 17:49
OA is right =)

B = 40/s
Av = 40/4 = 10/s
E = 10/5 = 2/s

2/s *60s = 120/min
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Re: printers [#permalink] New post 24 Aug 2007, 13:34
Ravshonbek wrote:
A certain business printer can print 40 characters per second, which is 4 times as fast as an average printer. If an average printer can print 5 times as fast as an electric typewriter, how many characters per minute can an electric typewriter print?

I got 2 but OA says 120

what do you think?


good, thanks a bit attention would be of help
Re: printers   [#permalink] 24 Aug 2007, 13:34
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