Question

30 men can dig a ditch in 15 days .How long will 45 men take to dig it?​

Answer 1

Step-by-step explanation:

Consider a unit of effort called “man days”. A task requiring, for example, 12 man days to complete can be accomplished in many ways: 1 man working 12 days, or 2 men working 6 days, or 3 men working 4 days, and so on. As long as the number of men multiplied by the number of days is 12, our task will be accomplished.

In the given question, it takes 10 men 12 days to do a job - that’s a 120 man day job. If we can increase the men from 10 to 15, it will take 120/15 or 8 days to accomplish the job.

Answer 2

Step-by-step explanation:

30 men 15days

1 man 450 days

45 men 10 days

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