An evaporator is concentrating solutions from two different sources. The solution from the first source containing 10% NaCl and 10% NaOH flows at the rate of 50 kg/min. The other solution containing 8% NaCl and 12% NaOH flows at the rate of 70 kg/min. The two streams are fed directly to the evaporator. If 50% of the total water is to be evaporated, calculate the composition and flow rate of the product.