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R does 1/36 th fraction of 1 job in an hourGmatKiss wrote:A company has two types of machines, type R and type 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
Let the job = 36 units.GmatKiss wrote:A company has two types of machines, type R and type 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
In 1 hour, machine R does 1/36th of the jobGmatKiss wrote:A company has two types of machines, type R and type 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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