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PS - Distance

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Director
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Joined: 10 Feb 2006
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PS - Distance [#permalink] New post 17 Nov 2007, 07:12
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Please provide an explaination.
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VP
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Joined: 08 Jun 2005
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 [#permalink] New post 17 Nov 2007, 07:53
Lindsay can paint 1/x of a certain room in 20 minutes.

Meaning she can paint 3/x of the room in one hour (20min*3).

Joseph can paint 1-3/x of the room in one hour or x/x-3/x = x-3/x

And in 20min (60min/3) he can paint (x-3)/x/3 of the room.

(x-3)/3x

the answer is (C)

:)
Director
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 [#permalink] New post 17 Nov 2007, 08:09
I used x = 10 and whole room = 20, made some lengthy calculations, and arrived at C as the answer.

Then I saw Killer's concise and elegant solution :)
  [#permalink] 17 Nov 2007, 08:09
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