A contractor employed 50 men to complete the project in 100 days. But later on he realised that just after 25 days only 20% of the work had been completed. How many extra days, than the scheduled time are required?
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20% work done in 25 days.
1% work done in = 25/20
100% work done = (25 *100)/20 = 125 days.
So, extra days required = 125 - 100 = 25 days.