1. Pipe A can fill a tank fully in 20 min and pipe B can empty the tank completely in 15 min. Tank is filled up to X%, then both pipes are opened and the tank is emptied in 18 min. What is the value X?
Pipe A can fill a tank fully in 20 min and pipe B can empty the tank completely in 15 min. Tank is filled up to X%, then both pipes are opened and the tank is emptied in 18 min. What is the value X?
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