1. Master Liu took money to buy screws. If he bought all the bolts, he could buy 200. If he bought all the nuts, he could buy 200. How many sets of screws could master Liu buy? 2. There are 10 questions in a mathematics test paper. The scoring rules are as follows: 10 points for one correct question, 2 points for one wrong question. Xiaoming answered all 10 questions, but only 76 points. Think about it, how many questions did he answer correctly 3. At 9:40 a.m., car a is 110 kilometers away from Fuzhou, car B is 90 kilometers away from Fuzhou, and at 10:50 a.m., the distance between car a and Fuzhou is three times that between car B and Fuzhou. At this time, how many kilometers is there between car a and Fuzhou?

1. 1/(1/200+1/200)=100
2. 10x-2(10-x)=76 => x=8
3. (110-90)/(3-1)*3=30

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