For the rice preparation problem in Example 12.5, 

if three cups of water are used to wash the rice before cooking, draw the Sankey diagram and determine the material efficiency.

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Example 12.5 Cooking 1 cup of dry rice requires 2 cups of water. In the cooking process 40 percent of the water evaporates, but with a covered pot most of it is recycled in such a way that the net loss of water is only 10 percent. Draw a Sankey diagram for this process. What is the material efficiency of this process? One cup of dry rice weighs 184 g and 2 cups of water weigh 480 g.