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Laura can paint 1/x of a certain room in 20 minutes. What

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Senior Manager
Senior Manager
Joined: 23 May 2005
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Laura can paint 1/x of a certain room in 20 minutes. What [#permalink] New post 05 Nov 2006, 00:08
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A
B
C
D
E

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Laura can paint 1/x of a certain room in 20 minutes. What fraction of the same room can Joseph paint in 20 minutes if the two of them can paint the room in an hour, working together at their respective rates?


1/3x

3x/x-3

x-3/3x

x/x-3

x-3/x
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Director
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 [#permalink] New post 05 Nov 2006, 00:13
The answer is c
Laura can paint 1/x in 20 minutes thus in 60 minutess she can paint 3/x
Thus joey paints 1-3/x =x-3/x in 60 minutes

In 20 minutes
x-3/x ...60
y.....20
y =20(x-3)/60x =x-3/3x
  [#permalink] 05 Nov 2006, 00:13
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Laura can paint 1/x of a certain room in 20 minutes. What

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