![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Volunteer a plans to finish some work in the community in several working days From the third working day, volunteer B will join in the work, and the work efficiency of both Party A and Party B is the same. As a result, the task will be completed 3 days in advance. The number of days the family plans to complete the work is (Note: from the third working day)
Suppose that the number of days a plans to complete the work is x days, then the efficiency of a is 1 / x, and the efficiency of B is 1 / X. A works for (x-3) days, and B works for (x-3-2) = (X-5) days
(x-3)/x+(x-5)/x=1
(2x-8)/x=1
2x-8=x
x=8
It is tested that x = 8 is the root of the original equation
A: Party A plans to complete the work in 8 days
For a job, it takes 12 hours for Party A to do it alone and 15 hours for Party B to do it alone. The ratio of work efficiency between Party A and Party B is (), and it takes () hours for Party A and Party B to do it together
The ratio of work efficiency has been calculated, which is 5:4, but I don't know how to calculate it?
The work efficiency should be 4:5, the cooperation time is 2 / (1 / 12 + 1 / 15) = 13.33 hours
For a project, Party A needs 10 hours to complete, and Party B needs 12 hours to complete. What is the time ratio of Party A and Party B to complete the work? What is the efficiency ratio?
The time ratio is 5:6 and the efficiency ratio is 6:5
A project is completed by Party A alone in 5 days and by Party B alone in 7 days. The work efficiency ratio of Party A and Party B is () and the work time ratio is
The work efficiency of a is 1 / 5
The work efficiency of B is 1 / 7
The ratio of work efficiency of Party A and Party B is 1 / 5:1 / 7 = 7:5
The ratio of working hours of Party A and Party B is 5:7 = 5:7
RELATED INFORMATIONS
- 1. 1: For a job, Party A can complete it in 6 days and Party B can complete it in 9 days. The time ratio for Party A to Party B to complete such a job is (2): (3) the work efficiency ratio is () 2: The total price of the three books is 13.5 yuan. The ratio of the total price to the quantity is (): (), and the ratio is (): (), which means () 3: A triangle and a parallelogram have the same area and the same base. The ratio of their height is (): () 4: The ratio of a and B is 3:2. The number of a is () times of that of B. what is the number of B?
- 2. For a project, it takes 6 days for Party A to complete and 10 days for Party B to complete
- 3. For a project, it takes 10 days for team a to complete it alone, and the work efficiency of team B is 14 times higher than that of team a A. 6：5B. 5：4C. 4：3D. 7：2
- 4. It takes 20 days for the two teams to work together on a project. The ratio of work efficiency of the two teams is 4:5. How many days does it take for the two teams to complete each project separately? You can't make equations, you have to explain and explain. Quick
- 5. There are two groups of workers, the ratio of work efficiency is 7:8, the ratio of number of workers is 5:6, and the ratio of working hours is 12:11
- 6. There are two groups of workers, the ratio of work efficiency is 7:8, the ratio of number of workers is 5:6, and the ratio of working hours is 12:11
- 7. Seven tons of goods are transported in eight times on average, a few percent of this batch of goods are transported each time, with each shipment of [] tons
- 8. There are seven tons of goods in a pile, which are transported in nine times. How many parts of the goods are transported each time? How many tons are transported each time?
- 9. The canteen transported 4 tons of coal and planned to burn it for five months. The average amount of coal burned in each month is expressed as several tons in fractions and () tons in decimals
- 10. A pile of coal, 1 / 40 of a day, 5 days, a total of a few parts of this pile of coal It's 5 days, not 1.5 days
- 11. Volunteer a plans to complete a certain work in the community in several working days. From the third working day, volunteer B joins in the work, and the work efficiency of both Party A and Party B is the same. As a result, the task is completed 3 days in advance, the number of days that volunteer a plans to complete the work is () A. 8B. 7C. 6D. 5
- 12. A manuscript of 60 pages, originally planned to finish in 5 hours, only 4 hours, work efficiency increased by several percent? This problem has caused controversy in our class. Will the final result be 20% or 25%, please give us the reasons or the formula,
- 13. It takes three hours for a manuscript to be typed, five hours for a manuscript to be typed, and the efficiency ratio of a and B is 1
- 14. After typing the same manuscript, it took two fifths of an hour for Party A and two thirds of an hour for Party B. () the work efficiency is high
- 15. To type a manuscript, it takes 4 hours for Party A to complete it alone, and 6 hours for Party B to complete it alone. The time ratio between Party A and Party B is (), and the work efficiency ratio is ()
- 16. For a batch of parts, it takes 8 hours for Party A to process them alone, 7 hours for Party B, and one hour for Party A and Party B to cooperate. How many parts of this batch of parts are completed
- 17. 40 points for 3 parts processed by Party A and 30 points for 4 parts processed by Party B. the work efficiency ratio of Party A and Party B is () A. 3：4B. 4：3C. 9：16D. 16：9
- 18. If a batch of parts are processed separately, it takes 8 hours for Party A and 10 hours for Party B. the efficiency ratio of Party A and Party B is 8:10______ (judge right or wrong)
- 19. For a project, it takes 9 days for Party A to do it alone, and 12 days for Party B to do it alone. The work efficiency ratio of Party A and Party B is ()
- 20. For a project, team a will complete it in 12 days and team B will complete it in 9 days. What is the ratio of work efficiency between team a and team B?