GMATPrep question 21

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mchen01: Newbie | Next Rank: 10 Posts; Posts: 9; Joined: Sat Nov 24, 2007 3:08 pm

by mchen01 » Mon Nov 26, 2007 8:38 pm

ARG... here's another one that I need help with

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Source: Beat The GMAT — Problem Solving | Mon Nov 26, 2007 8:38 pm

syv11: Senior | Next Rank: 100 Posts; Posts: 46; Joined: Fri Nov 23, 2007 1:36 pm

by syv11 » Mon Nov 26, 2007 8:48 pm

6 machines ..... take 12 days
1 machine .... takes 72 days (=6*12)
72/8 = 9 machines ... take 8 days

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mchen01: Newbie | Next Rank: 10 Posts; Posts: 9; Joined: Sat Nov 24, 2007 3:08 pm

by mchen01 » Mon Nov 26, 2007 9:03 pm

Thanks.

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