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2014-12-01T12:34:01+05:30

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So using unitary method

if 12 men can do in 18 day
so 1 man will do in 12×18=216 days.
so 8 men will do in 216/8=27 day

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i was mistaken
thank you
one more question is
give it in the messages
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2014-12-01T12:49:14+05:30
12 men can do a work in 18 days
8 men can complete it in x days.
Ratio of men = 12 : 8 = 3 : 2
Ratio of days = 18 : x

Both these ratios are in inversely proportional.

⇒ 3 : 2 = x : 18

⇒  \frac{3}{2} =  \frac{x}{18}

⇒2x = 54

⇒x = 27

8 men can complete the work in 27 days.
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