(Answered) A dryer works continuously to dry grain it performance is

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A dryer works continuously to dry grain. It performance is constant at 42.3 kg of water removed per hour. At the entrance of the dryer air is 40 degrees celcius and flowst at 1 m3/s. At the end of the dryer the air is at 20 degrees celcius and 90% relative humidity. What is the relative humidity of the air at the entrance to the dryer?

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