if 5 men can do certain work in 14 days then how long will 7 men take to complete the same work

Dear student
Using the concept of man×day=constantor m1×d1=m2×d25×14=7×d2d2=5×147d2=10So, 7 men will complete work in 10 days
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pls answer according to 6 grade
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and dont answer mening less things  for just earning points
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14 days only
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it ​will takem them 12 day because
5+9=14
7+9=16 there are more person so 16-4=12
therefore it ​will take t​welve days
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