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① Xiao Li collected 68 pieces of banknotes totaling 203 yuan, and donated them to Yushu disaster area. Except for 6 pieces of 5 jiao and 8 pieces of 1 yuan banknotes, the rest are 2 yuan and 5 yuan banknotes. There are () 2 yuan banknotes and () 5 yuan banknotes ② A ship sails downstream from wharf a for 100 minutes to wharf B, and then sails upstream for 2 hours to return to the wharf. The known water velocity is 3 km / h, then the distance between wharf A and wharf B is () km, and the ship's velocity in still water is () km / H ③ A clothing factory wants to produce a batch of certain type of student clothes. It is known that some kind of cloth less than 3 meters long can be made into two coats or three pairs of trousers. One coat and one pair of trousers are a set. It plans to use this kind of cloth 600 meters long to produce student clothes. How many pieces of cloth should be used to produce coats and trousers to match each other? How many sets can be produced? (solution to equation)
1. Solution: if 2 has x sheets, then 5 has 68-6-8-x = 54-x sheets, 2 × x + 5 (54-x) = 203-3-8 2x + 270-5x = 192 2x + 270 = 5x + 192 2x + 78 = 5x, 2 yuan x = 26 5 circle is; 54-26 = 28 2
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