A stream containing 30 mass% methanol (CH3OH) and 70 mass% water (H2O) must is mixed with another stream containing 10 mass% methanol and 90 mass% water. The is to make a product that contains 18% by mass of methanol and 82% by mass of water. a) Draw a flowchart. b) 20 kg/min of the product is needed (the stream with 18 mass% methanol). How big must the flow rate (in kg/h) of the stream with 10 mass% methanol be?