[36] 40 men can catch 200 sharks in 20 days working 6 hours a day. In how many days 25 men can catch 300

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40 men can catch 200 sharks in 20 days working 6 hours a day. In how many days 25 men can catch 300 sharks working 4 hours a day?

Explanation:
1st. 40 men can catch 200 sharks in 20 days * 6 hrs/day.
Thus, 1 man can catch 5 sharks in 20*6 hours
2nd. 25 men can catch 300 sharks in x days * 4 hrs/day
Therefore, 1 man can catch 6 sharks in 4*x hours.
(Notice that number of hours required, 4*x, has not been disturbed.)
Forward,
1 . 1 man can catch 5*6 sharks in 6*20*6 hours.
2. 1 man can catch 6*5 sharks in 5*4*x hours.
Calculations done in 1 and 2 are independent of each other.
All other values being equal, equating the number of hours from 1 and 2 we find x = 36.
Therefore, 25 men can catch 300 sharks working 4 hours a day in 36 days.

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