An assignment was given to a certain number of employees to finish in 200 days. But, due to some circumstances, 20 employees could not take part in it and it took 20 more days to be completed. How many employees were assigned to complete the assignment initially?

Let the initial number of employees be x, making the total work equal to 200x man-days. After 20 employees leave, the remaining x minus 20 employees take 220 days, so the total work can also be expressed as 220 times x minus 20. Equating the two gives 200x equals 220x minus 4400. Solving this equation results in 20x equals 4400, which means x is 220. The answer is 220.

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