3 pumps, working 8 hours a day, can empty a tank in 2 days, How many hours a day must 4 pumps work to empty the tank in 1 day?
Answer: 12
Explanation
Let's calculate the total pump-hours required to empty the tank:
3 pumps * 8 hours/day * 2 days = 48 pump-hours
If 4 pumps need to empty the tank in 1 day:
Let x be the number of hours they need to work:
4 pumps * x hours/day * 1 day = 48 pump-hours
4x = 48
x = 12
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