A new coating is prepared with 100 yuan a coating and 200 yuan B coating. Its price per kilogram is 3 yuan less than that of a coating and 1 yuan more than that of B coating. How much is the price per kilogram of this new coating?
Suppose the price of this new coating is x yuan per kilogram, then the unit price of a coating is x + 3, and the unit price of B coating should be X-1. According to the meaning of the title: 100x + 3 + 200X − 1 = 300X, the solution is: x = 9. After testing, x = 9 is the solution of the original equation, which also conforms to the meaning of the title. Answer: the price of this new coating is 9 yuan per kilogram
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