Question

If 3 workers collect 48 kg of cotton in 4 days, how many kg of cotton will 9 workers collect in 2 days

Answer 1

3 workers = 48kg in 4 days, 1 worker = 16 kg in 4 days 
16 kg = 4 days, 4 kg = 1 day. 
So one worker collects 4 kg in one day 

9 workers collect 4*9 = 36 kg in one day 
In two days, 9 workers collect 2 * 36 = 72 kgs