A man does 10\24 hectares in a day.
36 men do in 30 day 10*36*30\24=450 hectares.
A very quick way of looking at this is that you have
36/8 times the manpower and 30/24 times the available time.
Hence your output will be increased by 36/8 x 30/24 or
80 x 36/8 x 30/24 = 450.
Former Senior Instructor, Manhattan GMAT and VeritasPrep
Vice President, Midtown NYC Investment Bank, Structured Finance IT
MFE, Haas School of Business, UC Berkeley, Class of 2005
MBA, Anderson School of Management, UCLA, Class of 1993