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need explanation, rate question

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need explanation, rate question

by tacobell » Sun May 04, 2008 5:49 pm
6 machines, each working at the same constant rate, together can complete 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.

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Thanks in advance.
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by simplyjat » Sun May 04, 2008 9:17 pm
already discussed https://www.beatthegmat.com/rates-and-work-t1848.html
simplyjat
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