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GMAT Prep Question - Work / Rates

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by werdwerd » Mon Mar 09, 2009 12:24 pm
Six machines, each working at the same constant rate, together can complete a certain job in 12 days. How many additional machines, each working at the same constant rate, will be needed to complete the job in 8 days?

This question is off of the GMAT Prep test I took.

Can someone please walk me through this one? I think I'm getting thrown off because there's 6 individual units working, rather than 1 and another, i'm going in circles in my head. Thank you!
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by keeyu2 » Mon Mar 09, 2009 12:38 pm
6 machines = 12 days

set 1/6 ( = 1 machine ) = 12 days.
1 machine = 72 days.

9 machines = 8 days

I think.
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by ML » Tue Mar 10, 2009 6:18 am
additional machines so 9-6=3 machines
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by werdwerd » Tue Mar 10, 2009 5:32 pm
perfect - thank you!
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