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A company has two types of machines, type R and S. Operating

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A company has two types of machines, type R and S. Operating [#permalink] New post 25 Dec 2005, 16:22
A company has two types of machines, type R and S. Operating at a constant rate, a machine of type R does a certain job in 36 hours and a machine of type S does the same job in 18 hours. If the company used the same number of each type of machine to do the job in 2 hours, how many machines of type R were used?

a) 3
b) 4
c) 6
d) 9
e) 12
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Re: GMATPrep Question [#permalink] New post 25 Dec 2005, 16:53
MBAHopeful wrote:
A company has two types of machines, type R and S. Operating at a constant rate, a machine of type R does a certain job in 36 hours and a machine of type S does the same job in 18 hours. If the company used the same number of each type of machine to do the job in 2 hours, how many machines of type R were used?

a) 3
b) 4
c) 6
d) 9
e) 12


My answer is C

X = number of each type of machine

x(1/18) + x(1/36) = 1/2
3x/36 = 1/2
36 = 6x
x = 6
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Re: GMATPrep Question [#permalink] New post 25 Dec 2005, 17:15
TeHCM wrote:
MBAHopeful wrote:
A company has two types of machines, type R and S. Operating at a constant rate, a machine of type R does a certain job in 36 hours and a machine of type S does the same job in 18 hours. If the company used the same number of each type of machine to do the job in 2 hours, how many machines of type R were used?

a) 3
b) 4
c) 6
d) 9
e) 12


My answer is C

X = number of each type of machine

x(1/18) + x(1/36) = 1/2
3x/36 = 1/2
36 = 6x
x = 6


Yes, you are right. Thanks for answering the questions so promptly.
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Senior Manager
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Re: GMATPrep Question [#permalink] New post 25 Dec 2005, 23:39
I agree with techCM, My working is same as her.
:lol:
Re: GMATPrep Question   [#permalink] 25 Dec 2005, 23:39
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