The school bought 120 sets of desks and chairs at the same price for the first time and 145 sets for the second time. The second time cost 2625 yuan more than the first time. How much did the school spend on desks and chairs for the first time?

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• 1. The school needs to spend a sum of money to buy a batch of desks and chairs. If you buy a set of 500 yuan, you will have 800 yuan left. If you buy a set of 600 yuan, you will have two sets less than what you plan to buy. How much money does the school have to buy desks and chairs?
• 2. The school has a sum of money to buy tables and chairs If you only buy a table, you can buy 40; if you only buy a chair, you can buy 60; if you want to buy a complete set (one table and one chair), you can buy () sets for this money, assuming that the money is available
• 3. The price of a desk is three times that of a chair. The school bought 30 sets of desks and chairs for 2400 yuan. How much are the desks and chairs?
• 4. At the beginning of school, the school bought a batch of desks and chairs. The price of the desks was 474 yuan, 12 yuan less than three times that of the chairs. How much did the chairs cost?
• 5. At present, 121 tons of goods need to be transported, [car a can transport 5 tons, 400 yuan], [car B can transport 8 tons, 500 yuan], [car C can transport 10 tons, 600 yuan] Suppose every car is full ① If there are 13 vehicles in total, how many are vehicles a, B and C? What is the freight? ② Can you tell me how to ship it and how much is the least freight?
• 6. Party A deposits 500 yuan in the bank and Party B deposits 720 yuan in the bank. After that, Party A deposits 50 yuan and Party B deposits 120 yuan every month. A few months later, Party B's deposit is exactly 2 yuan of Party A's
• 7. The price of a dress is 500 yuan, 20% off, and 60% profit will be made after it is sold. How much is the cost price of this dress? Seek a complete solution
• 8. The cost of manufacturing a kind of machine parts is 500 yuan. Now it's 200 yuan lower. What's the decrease? Now it's 200 yuan lower, what's the decrease?
• 9. The price of a dress is 500 yuan, 20% off, and 25% profit. The cost price of this dress is () The price of a dress is 500 yuan, 20% off, and 25% profit. The cost price of this dress is ()
• 10. The cost price is 200 yuan. If I sell it for 500 yuan, I only charge 30% of the profit. What is the fastest and most convenient way?
• 11. Someone bought a horse with 600 yuan, sold it for 700 yuan, and bought it back with 800 yuan In the end, he sold the horse for 900 yuan I lost 100 yuan Parallel revenue and expenditure Made 100 yuan Made 200 yuan Made 300 yuan
• 12. Buy a bicycle with 600 yuan, sell it with 700 yuan, buy it back with 800 yuan, and finally sell it with 900 yuan. How much do you earn? On this issue, I would like to say that if you buy a bicycle at a cost of 1000 yuan, sell it at 600700 yuan, buy it back at 800 yuan, and sell it at 900 yuan, the formula is 1000-600 + 700-800 + 900 = 1200, and you can earn 200 yuan But the first time you sell 900, and then you buy 800 back, you can actually buy 600. The formula is 1000-600 + 900-600 + 900 = 1600, and the final result is 1600-1200 = 400. I don't know whether my understanding is right or wrong Here I am saying to those who say that they are earning 200: losing money is not just losing money on the basis of the original plan. More often, you have to find out how to make more money with the greatest benefit. Earning 200 is earning, But you can make more money. Of course, the position of making 200 is in mathematics. Now we should think about it from various angles. Of course, my answer is not necessarily 100% right
• 13. Who has 10 school sports meeting broadcast manuscripts, each about 200 words, reward 5 points, if good, add a few points, to essay, not poetry The broadcast of the school sports meeting can be sent to the referee and athletes,
• 14. I want the broadcast draft of winter sports meeting in primary school tonight (before 9 o'clock). I don't want poetry. I want a short essay of about 100 words Don't talk empty. I'm going to (before 9 o'clock) tonight. I don't want poems. I want short essays of about 100 words. Don't copy!
• 15. Sports broadcast draft to poetry, not composition, try to be around 200 words It's best to encourage athletes
• 16. As shown in the figure, the hammer, shot put, discus and javelin in sports are all the movements of throwing objects obliquely upward A. The kinetic energy of the object increases all the time, and the gravitational potential energy decreases all the time. B. the kinetic energy of the object decreases all the time, and the gravitational potential energy increases all the time. C. The kinetic energy of the object decreases first and then increases, and the gravitational potential energy increases first and then decreases. D. the kinetic energy of the object increases first and then decreases, and the gravitational potential energy decreases first and then increases
• 17. Ask for 20 sports meeting about: high jump, long jump, shot put manuscript
• 18. Sports meeting manuscripts, high jump, long jump and shot put
• 19. For the broadcast draft of the junior high school sports meeting, for high jump and long jump, the number of words is about 100,
• 20. The broadcast draft of the sports meeting should be 60m 100m 200m 400m 800m long jump softball shot put 4 * 100m relay, 3 for each. Kneel down!