If you make a batch of parts, you can finish one third of it in 18 days. If you work for 4 days, your work efficiency will be improved by one fifth How many days will it take to complete half of this batch of parts? The sixth grade method is easy to understand

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• 1. Manufacturing a batch of parts, according to the plan 18 days to complete its 12, if the work efficiency is improved after 3 days, then how many days will it take to complete this batch of parts in total?
• 2. If we make a batch of parts, we can finish half of it in 18 days according to the plan. If we work for 3 days, the work efficiency will be improved by 1 / 8, how many days will it take
• 3. 1 / 2 × 2 / 3 × 3 / 4 ×... × 99 / 100. What is the product of 99 fractions?
• 4. 1. Simple calculation of {1 - (half quarter)} by two thirds 2.20000 divided by 12.5 divided by 25 divided by 0.8 divided by 4 3.38 times quarter + 17 times 0.25 plus 45 times 25% Simple calculation of 4.2.78 times 7.8 + 2.78 times 3.2-2.78
• 5. 1 plus half plus two thirds plus three quarters. Add n + 1 / N, what is the result?
• 6. If two-thirds a equals one-half B, then a is equal to (three-quarters, four-thirds, or two-thirds) B
• 7. What is one minus one half
• 8. X to a quarter is half to three tenths
• 9. One half to one fifth equals x and one tenth
• 10. When 2A minus 3b, a plus 2B equals 3
• 11. One half of a batch of parts can be finished in 18 days according to the plan. If the efficiency is improved by 1 / 8 after 3 days, the batch of parts can be finished How many days does it take for 1 / 3 of the total
• 12. It takes 15 hours for Party A to produce a batch of parts by itself, while the work efficiency of Party B is 50% higher than that of Party A. Party B can complete the work in a few hours by itself and cooperate with each other in a few hours
• 13. To make a batch of parts, it takes 12 hours for Party A to complete it alone. Given that the work efficiency ratio of Party A and Party B is 4:3, how long does it take for Party B to complete it alone? (answer in proportion)
• 14. A manuscript should be typed in half an hour for Party A and in one third an hour for Party B. the efficiency of Party A is the same as that of Party B
• 15. The master and the apprentice worked together to make a batch of parts. The apprentice made a total of 27 parts, 21 less than the master. How many parts are there in this batch?
• 16. The master and the apprentice process a batch of parts. The number of parts processed by the master is 25 more than the total number of 12. The number of parts processed by the apprentice is 13 times that of the master. How many parts are there in total?
• 17. It takes 15 hours for the master and the apprentice to process a batch of parts. The apprentice processes 30 parts per hour and completes the task at the same time. The number of parts processed by the apprentice is 5 / 9 of the master's
• 18. It takes 37 hours for the master and the apprentice to process a batch of parts. The apprentice can process 30 parts per hour. Now the master and the apprentice process them at the same time. When they finish the task, the number of parts processed by the apprentice is 59 times that of the master?
• 19. It takes 20 hours for the master to work alone, 30 hours for the apprentice to work alone, and how many hours for the two to work together? When completing the task, the master made 96 more parts than the apprentice. How many parts are there in total?
• 20. The master and the apprentice worked together to make a batch of parts. The apprentice made a total of 27 parts, 21 less than the master. How many parts are there in this batch?