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A. B is 375 km away from each other. Car a runs 67 km per hour, and car B runs 58 km per hour. The two cars leave each other at the same time. How many hours do they meet?
375 (67 + 58) = 375 (125) = 3 (hours) a: after 3 hours
The first bus runs 192 kilometers in the first three hours and 58 kilometers in the second two hours. What's the average speed of this bus?
The sum of 192 and 58 divided by 5 is 50
How many hours did it take for two cars to travel at the same time from two places 276 kilometers apart, one 57 kilometers per hour and the other 58 kilometers per hour?
(276 + 69) / 57 + 58 = 3 (hours)
The cement of site a and site B is 5; 3, 36 tons are transported from site a to site B, and the ratio is 4; 6. How many tons of cement is there in site a,
1. Using the number of shares to solve the problem
Suppose that the original number of shares of Party A and Party B is 5 and 3, and the later number is 4:6, but the total number of shares has not changed, so the number of shares of Party A and Party B is 3.2 and 4.8 at this time. The change of 1.8 shares corresponds to 36 tons, and each share is 20 tons. Then the original number of shares of Party A and Party B is 100 tons and 60 tons respectively
2. Solve by equation
It turned out to be x tons per copy
（5X-36）*6=4（3X+36）
The solution is x = 20 tons
Two motorcades transported 240 tons of cement to the construction site, 60 tons more than three times that of team B. how many tons did Team B transport
Let B transport x tons
3x+60=240
3x+60-60=240-60
3x=180
3x÷3=180÷3
x=60
Team B transported 60 tons of cement
Equality relation: tonnage transported by team B × 3 + 60 = tonnage transported by team a
Complete enough, choose me
Two motorcades transported cement to the construction site. Team a transported 240 tons, 60 tons less than team B three times. How many tons did Team B transport? Use different equations to solve?
Team B transported x tons
Then (240 + 60) = 3x
Or 3x-60 = 240
The solution is x = 100 (tons)
Two teams of cement were transported to the construction site. Team a transported 240 tons, 60 tons less than team B three times. How many tons did Team B transport
Calculation by two methods of equation
Let B transport x tons. Let B transport x tons
3x-60=240 3x=240+60
3x-60+60=240+60 3x=300
3x=300 3x÷3=300÷3
3x÷3=300÷3 x=100
x=100
A: Team B transported 100 tons
Two motorcades transported 240 tons of cement to the construction site, 60 tons more than three times of the existing motorcade
Two motorcades transported 240 tons of cement to the construction site, 60 tons more than three times of the existing motorcade. How many tons of cement has been transported by the existing motorcade
(240-60) / 3 = 60 tons
It is known that the sum of number a and number B is 300, and 25 of number a is 55 more than 14 of number B. then what are the numbers a and B?
The number of a number is x, so the number of B is 300-x, and from the meaning of the topic, you can get: 25X - (300-x) × 14 = 55 & amp & nbsp; from: 25X - (300-x-300-x) × 14 = 55 & nbsp; from the meaning of the topic: 25X - (300-x) × 14 = 14 = 55 & nbsp; from the meaning of the topic, you can get: 25X - (300-x - (300-x)) × 14 = 55 & amp & nbsp & nbsp; & nbsp & nbsp; & nbsp & nbsp; & nbsp; & nbsp & nbsp & nbsp & nbsp; & & nbsp; & amp & nbsp & nbsp; & & nbsp; & & nbsp & nbsp; & & nbsp; & & nbsp; & & nbsp; & & nbsp; & nbsp; & & nbsp; & nbsp; & nbsp; & & nbsp; & nbsp; & nbsp & nbsp; & nbsp & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp& nbsp; & nbsp; &A: the number a is 200 and the number B is 100
The two engineering teams of a and B jointly dug a 300 meter long canal. Two fifths of the canal dug by team a is 55 meters more than one fourth of that dug by team B. how much did each team dig
Linear equation of one variable
If a digs x meters, B digs (300 -- x) meters,
According to the meaning of the title:
2X/5--(300--X)/4=55
The solution of this equation is as follows
X=200
300--X=100
A: a dug 200 meters, B dug 100 meters
RELATED INFORMATIONS
- 1. There are 300 workers in the two workshops. Two fifths of the workers in workshop a are 55 more than one fourth of the workers in workshop B. how many workers are there in each workshop?
- 2. Car a runs 60 kilometers per hour for X hours; car B runs 58 kilometers per hour for y hours 58y denotes (); X-Y denotes (); 60x + 58y denotes () How do you write it?
- 3. A simple algorithm of 47 times 16 plus 52 times 16 plus 16
- 4. The structure of an organic compound is determined: the mass fraction of carbon of the organic compound containing Cho is 64.86%, and the mass fraction of hydrogen is 13.51%. Q: what is the molecular formula? There's a mass spectrum that hasn't been transmitted
- 5. A certain organic matter is composed of carbon, hydrogen and oxygen. 0.1mol of the organic matter has a mass of 4.6g. The complete combustion of 4.6g of the organic matter requires 1.12l of oxygen to produce the secondary oxygen The amount of carbon and water is equal. Try to deduce the molecular formula of the organic matter and write out the possible structural formula
- 6. The relative mass fraction of carbon in a hydrocarbon is 83.3% determined by combustion analysis experiment. (1) if there is only one absorption peak on the hydrogen NMR spectrum of the hydrocarbon, the structural formula of the hydrocarbon is --, and the name of a hydroxyl substituent is --. (2) if the hydrocarbon is obtained by adding H2 to monoolefin, there are -- monoolefins that meet the conditions
- 7. In order to judge whether a compound contains carbon, hydrogen and oxygen, a certain mass of the compound should be fully burned in oxygen. The following experiments are needed: (1) using anhydrous copper sulfate to check whether there is water formation; (2) using clear lime water to check whether there is carbon dioxide formation; (3) using wood strips with Mars to check oxygen; (4) determining the mass of water and carbon dioxide A. ①②③B. ①②④C. ②③④D. ①②③④
- 8. There is a kind of organic matter, 23g, which is completely burned in the air to generate 44g of carbon dioxide and 27g of water. What is the mass of carbon element in the organic matter? What is the mass of hydrogen?
- 9. Coal is an important chemical raw material. Using coal as fuel is not only a great waste, but also because coal contains sulfur, the sulfur dioxide generated after combustion will cause air pollution. 1% of sulfur-containing coal is directly burned and discharged without treatment. Four tons of sulfur dioxide gas is discharged into the atmosphere every day. How many tons of coal is burned in this plant every day
- 10. After a substance is fully burned in oxygen, it will produce carbon dioxide and water. The substance must contain carbon and hydrogen. It may contain oxygen. Why
- 11. For a project, if Party A works for three days and Party B works for five days, half of it can be completed; if Party A works for five days and Party B works for three days, one third of it can be completed A project can be completed in three days for Party A and five days for Party B, and one third in five days for Party A and three days for Party B. how many days will it take for Party A and Party B to cooperate
- 12. There are two oil pots, each containing one kilogram of oil. The oil in bottle a accounts for half of the bottle, and the oil in bottle B accounts for one third of the bottle
- 13. The weight ratio of a and B bags of rice is 7:6. Take out 40 kg from a bag and put it into B generation. The weight ratio of a and B bags of rice is 5:8. How many tons of rice were originally loaded in B generation
- 14. Both warehouses A and B store rice, and warehouse A stores 91.2 tons less than warehouse B. take 30% of the rice stored in warehouse A and 65% of the rice stored in warehouse B. at this time, the weight of the rice stored in the two warehouses is exactly the same. How many tons of rice did warehouse a store originally?
- 15. The goods quality ratio of warehouse A and warehouse B is 7:5. After 650 tons of goods are transported from warehouse A to warehouse B, the goods quality ratio of warehouse A and warehouse B becomes 3:4, and the original value of warehouse A is calculated
- 16. Coal is one of the main mineral resources in Panzhihua. Coal production enterprises need to calculate the cost of coal transportation to the coal users and include it into the enterprise production plan. A coal mine has 1000 tons of coal to be transported to plant a and plant B. through understanding, the relevant information of plant a and plant B is obtained as follows (the freight column "yuan / T · km" in the table indicates: the cost of one kilometer per ton of coal transportation (1) write the functional relationship between the total freight y (yuan) and the coal quantity x (T) transported to plant a, and write the value range of the independent variables; (2) please use the relevant knowledge of the function to design the transportation scheme with the least total freight for the coal mine, and Find out the least total freight (which can be expressed by algebraic formula with a)
- 17. There are two barrels of oil. The mass of barrel a is 1.2 times that of barrel B. if 5 kg of oil is poured into barrel B, the mass of the two barrels of oil will be equal. How many kg of the two barrels of oil are each? Use the formula instead of the equation
- 18. The ratio of a and B is 5:3. 90 barrels are transported from a warehouse and put into B warehouse. The ratio of a and B is 2:3. How many barrels of original oil in B warehouse?
- 19. There are 40 kg of oil in the two barrels. After 1 / 6 of the oil in barrel a is poured into barrel B, the weight ratio of the two barrels is 3:5. How many kg of the original oil in barrel a?
- 20. A batch of coal is transported to a power plant. It was originally planned to burn 10 tons of coal every day, but it is finished in 36 days. Actually, it saves 10% of coal every day. How many days can it burn