A certain number of men can do a work in 20 days. If there were 4 more men, they. would finish it in 4 days less. How many men are there ?

 A certain number of men can do a work in 20 days. If there were 4 more men, they. would finish it in 4 days less. How many men are there ?

A). 11 men

B). 13 men

C). 16 men

D). 19 men

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