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2015-06-28T21:01:54+05:30

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20 machines complete work in 28 days
⇒1 machine completes work in 28*20 days.
Remaining machines=20-6=14
⇒14 machine completes work in 28*20/14=2*20=40 days.
Ans:It will take 40 days to complete the work.
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