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Question

24 men can complete a work in 20 days. How many more men are required to complete the work in 12 days?
  1. 40
  2. 12
  3. 16
  4. 18


Solution

The correct option is C 16

Method 1: Using man-days

Amount of work in terms of man days  =24×20=480  man days

So, number of men required to complete the work in 12 days  =48012=40  men.

16 more men are required. Hence option (c)

Method 2: Using constant product rule

Decrease in number of days  =1(208)=12.5

Increase in number of men  =11.5= 16 men to finish the same work.

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