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

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• 1. 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
• 2. 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
• 3. 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?
• 4. 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
• 5. 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
• 6. There are 3 tons of coal in a pile, which is burned out in 20 days. How many tons of coal is burned every day on average? What percentage of the coal is burned every day on average?
• 7. The two piles of coal a and B are equal. A transports 25 tons, B transports 17 tons, a surplus: B surplus = 13:15, how many tons did a and B originally have It's better to use fractions or fractions instead of equations
• 8. 6, a and B two cement heap, originally a pile of cement is B pile, if from the pile of 6 bags to a pile, a pile of cement is B pile, the original total. 6, a and B two cement heap, originally a pile of cement is the 5/7 of B pile, if the 6 piles of piles from the B pile to a pile, a pile of cement is the 4/5 of the pile.
• 9. Twenty five percent of a pile of coal was used up, and then 18 tons of coal came in, five percent more than before. How much coal was there?
• 10. There is a pile of coal. After 40% of the total coal is used up, another 30 tons are transported. At this time, the amount of coal is 20% more than the original coal. How many tons of this pile of coal are there emergency
• 11. 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
• 12. 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
• 13. For a project, it takes 6 days for Party A to complete and 10 days for Party B to complete
• 14. 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?
• 15. 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)
• 16. 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
• 17. 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,
• 18. 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
• 19. 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
• 20. 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 ()