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A open tank is filled with 100 gal of water. Suppose every minute 5% of the water and 50% of the ethanol evaporates. The tank

A open tank is filled with 100 gal of water. Suppose every minute 5% of the water and 50% of the ethanol evaporates. The tank is replenished by a solution of 50% water and 50% ethanol, so that the tank is always full. Find the limiting percentage of ethanol in the tank

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