1. Master Zhang processed a batch of parts, and the ratio of the number of parts completed on the first day to the total number of parts was 1: 3. If you make 36 more parts, you can finish half of them. How many parts are there in this batch?
2. Concrete can be prepared with 3 parts of yellow sand, 2 parts of cement and 5 parts of stone. Now 2000 kilograms of concrete should be prepared on the construction site, and there are 300 kilograms of cement on the construction site. Is it enough?
The canteen used 45 tons of coal in May, 5 tons less than that in April. What percentage was saved?
4. Miss Li leads 45 students in her class to the zoo, each ticket is 10 yuan. According to the regulations of the park, people above 10 can enjoy the discount of group tickets, and the tickets are 20% off. Miss Li bought a door with 400 yuan.
Tickets, enough? Explain the reason after calculation.
Now there is only one week before leaving school, and the school has to brush 960 sets of tables and chairs. It takes 12 days for Team A to go it alone, and 8 days for Team B to go it alone. If the two teams cooperate, can they finish the task before school starts?
6. Xiaoming typed a manuscript of 1000 words on the computer, and typed 40% in the first five minutes. At this rate, how many minutes will it take to complete the manuscript?
7. Xiao Ming planned to spend 12 days reading a book, but actually read 40% in the first five days, according to this calculation.
Can Xiao Ming finish reading this book as planned?
I hope these exercises can help you!