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11 Jun 2010, 01:16
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Hello
I will attempt to reproduce a question from Gmatprep that I could not answer. Unfortunately I do not have the original problem as I have stupidly reset the test after finishing it (q48,v44) and could not review my errors. But i know i didn't get this problem right because my answer was not in the answer choices.
Machine A and Machine B, working at their respective constant rates, can finish a job in 2 hours.
Machine A and Machine C, working at their respective constant rates, can finish a job in 3 hours.
Machine B and Machine C, working at their respective constant rates, can finish a job in 4 hours.
In how many hours can machine A,B,C, woring together at their respective constant rates, finish the job ?
A+B=2
A+C=3
B+C=4
=> 2A+2B+2C=9 => A+B+C= 9/2= 4,5 4 hours and 30 minutes.
This is how i solved the problem, yet i didn't get the right answer. Why?
Thanks
I will attempt to reproduce a question from Gmatprep that I could not answer. Unfortunately I do not have the original problem as I have stupidly reset the test after finishing it (q48,v44) and could not review my errors. But i know i didn't get this problem right because my answer was not in the answer choices.
Machine A and Machine B, working at their respective constant rates, can finish a job in 2 hours.
Machine A and Machine C, working at their respective constant rates, can finish a job in 3 hours.
Machine B and Machine C, working at their respective constant rates, can finish a job in 4 hours.
In how many hours can machine A,B,C, woring together at their respective constant rates, finish the job ?
A+B=2
A+C=3
B+C=4
=> 2A+2B+2C=9 => A+B+C= 9/2= 4,5 4 hours and 30 minutes.
This is how i solved the problem, yet i didn't get the right answer. Why?
Thanks
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11 Jun 2010, 01:46
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2/A +2/b + 2/C = 1/2 + 1/3 + 1/4
=> 1/A + 1/B +1/C =13/24 rate
in order for them to finish 1 job they would need 13/24 hours ??
This is the way to solve it ?
=> 1/A + 1/B +1/C =13/24 rate
in order for them to finish 1 job they would need 13/24 hours ??
This is the way to solve it ?
