An evaporator is concentrating solutions coming from two different sources. The solution from the first source containing 10% NaCl and 10% NaOH flows at the rate of 53kg/min. The other solution containing 8% NaCl and 12% NaOH flows at the rate of 81 kg/min. Two streams are fed directly to the evaporator. If 31% of the total water is to be evaporated, what is the flowrate of the product stream in kg/min?

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