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Work - m machines

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by Brent@GMATPrepNow » Mon Feb 16, 2009 3:11 pm
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Please note that this is not an official GMAT question; it’s my attempt to create difficult (650+ level) GMAT-style questions for this forum.
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by tini » Mon Feb 16, 2009 3:59 pm
m machines work m hrs and finish in m days
m machines work 1 hr and finish in m*m days
1 machine works 1 hr and finish in m*m*m days
k machine work 1 hr and finish in (m^3)/k days
k machine work k hrs and finish in (m^3)(k^2) days

is this the answer?
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by Brent@GMATPrepNow » Mon Feb 16, 2009 4:05 pm
tini wrote:m machines work m hrs and finish in m days
m machines work 1 hr and finish in m*m days
1 machine works 1 hr and finish in m*m*m days
k machine work 1 hr and finish in (m^3)/k days
k machine work k hrs and finish in (m^3)(k^2) days

is this the answer?
If you meant (m^3)/(k^2) days, then you are correct.

My solution is similar:
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by Brent@GMATPrepNow » Mon Feb 16, 2009 4:07 pm
Another option is to assign m and k values, determine the numerical answer, and then see which answer choice yields the same value.
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by tini » Mon Feb 16, 2009 5:08 pm
yes. i missed out the slash.a typo.
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by griscomtestprep » Tue Feb 17, 2009 12:17 am
work = work
m*m*m=k*k*x
x=m^3/k^2
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