2. Use a wire with the length of 12.4 decimeter to form an isosceles trapezoid. It is known that the two waists of this trapezoid are 6.4 decimeters long and the area is 9 square decimeters. What is the height of this trapezoid?
There are several geese and ducks in the river, among which the number of ducks is four times that of geese. I also know that there are 27 geese in Abby Mallard. How many geese and ducks are there?
4. A forest farm should plant 2000 trees, with an average of 350 trees per day in the first three days. The rest are required to be planted in two days. How many trees should be planted on average every day?
The distance between a and b is 480 kilometers. A car travels 60 kilometers per hour from A to B, and once every hour when it returns.
40 kilometers, what's the average speed of this car?
6. The road team built a section of road. In the first 8 days, the average daily150m, and the remaining 3000m will be repaired in 4 days. How many meters does this road team build roads every day on average?
7. A train traveled 272 kilometers in 4 hours. According to this calculation, ①. How many hours does it take to drive 23 12 km? ② How many kilometers did this train travel in 15 hours? (Answer in two ways)
8. This clothing factory used to make a 2.5-meter cloth. After adopting the new cutting method, each suit saves 0.5 meters. How many sets of cloth can you make now from the original 60 sets of clothes?
9. The engineering team built a 54-kilometer-long highway, and 6.3 kilometers were built in the first seven days. At this rate, how many days will it take to finish the rest?
10, A and B are 480 kilometers apart. Two cars, A and B, start from A and B at the same time and drive in opposite directions. Six hours after the meeting, the speed of car A is 45 kilometers per hour, and how many kilometers per hour is car B?
13. The construction team is going to build a 4.8km long canal, which is scheduled to be completed on 15. In fact, 0.08km more is built every day than originally planned. How many days has this task actually been completed?
14, Grade 6 students collect tree species. 1 class of 45 people, each collecting 0. 13 kg, 2 classes of * * 36 people collecting 6. 15 kg. How many kilograms of tree species did Class Two collect?
15, four giant pandas ate 169. 12 Jin of bamboo leaves in two weeks. How many kilograms of bamboo leaves does each giant panda eat every day?
16, clothing factory makes school uniforms. Now every 2 meters of cloth is used, which is 0.2 meters less than the original. How many sets of cloth can 880 sets of school uniforms make?
17, a barrel with a weight of 9.2 kg. Half poured, and the barrel weighs 5.6 kilograms. How much does this bucket weigh?
18, Xiaoming's new room is going to be paved with square bricks. If you use a square brick with an area of 0.09 square meters, you need 160. If you use a square brick with a side length of 0.4 decimeter, how many pieces do you need?
19. A steel mill planned to produce 54,000 tons of steel throughout the year, and the task was completed two months ahead of schedule. How many tons is the actual monthly output more than planned?
20. The school bought 4 desks and 9 chairs for 89 1 yuan. It is known that the desk of 1 costs the same as six chairs. How much is each chair and table?
23. A canal was originally planned to be built 0.45 km per day and completed in 30 days. The actual daily work efficiency is 1.2 times of the original plan. How many days does it actually take to complete this task?
24. A farm tool factory produces 2,500 small farm tools. In the first five days, it produces 180 pieces every day, and the rest should be completed in eight days. How many farm tools should be produced every day?
25. The school canteen returned 26 bags of flour, 20kg each. The returned rice weighs 80 kilograms, less than twice the weight of flour. How many kilograms of rice were returned?
26. A construction site needs 47 tons of sand, which was transported six times by a 4.5-ton truck, and the rest was transported by a 2.5-ton truck. How many times will it be transported?
27. Trapezoidal orchard has a bottom of 240m, an upper bottom 180m and a height of 60m. If each fruit tree covers an area of 9m2, how many fruit trees are there in this orchard?
28. A passenger train and a freight train set off from two cities, A and B, and met for four hours. It is known that the speed of passenger trains is 90 kilometers per hour, which is 1.5 times that of freight trains. What's the distance between the cities of A and B?
30. A workshop of the fitness factory binds a batch of exercise books. If you bind 600 books per hour, you can finish the task in 8 hours. If you bind 800 books per hour, how many hours can you finish the task ahead of schedule?
3 1. Jingjing read a story book on page 129. She has been reading it for 7 days, reading 12 pages every day, and the rest read 15 pages every day. How many days can she finish it?
32. For two barrels of oil, the weight of barrel A is 1.8 times that of barrel B. If you take out 1.2 kg from barrel A, the weight of two barrels of oil will be equal. How many kilograms are there in each barrel?
33. A billboard is triangular, with a base length of12.5m and a height of 6.4m.. If you want to paint the billboard with 0.4 kg paint per square meter (only one side), how many kg does it take to paint this billboard?
36. Both parties process the same machine parts. Party A processed 280 parts, 40 less than the number of parts processed by Party B in five days. How many parts does Party B process on average every day?
37. The sports group bought 4 soccer balls and 20 skipping ropes, which cost 238.4 yuan. It is known that every skipping rope 2.8 yuan. How much is each football?
39. The experimental primary school has 108 students, among whom the number of boys is 1.4 times that of girls. How many boys and girls are there in the science and technology group?
40. There are three times as many people skipping rope as kicking shuttlecock in sports competitions. It is known that kicking shuttlecock is 20 times less than skipping rope. How many people jump rope and kick shuttlecock respectively?
4 1. Adail bakery makes a birthday cake, and each cake needs 0.32kg of flour. Master Wang collected 5 Jin of flour to make cakes. How many birthday cakes can he make at most?
42. The fruit shop sent 495 kilograms of apples, which were packed in cartons. How many cartons do you need if each carton contains 25 kilograms?
43. There are 39 three-wheeled motorcycles and two-wheeled motorcycles in the motorcycle field. These two kinds of motorcycles have 96 wheels. How many three-wheeled motorcycles and two-wheeled motorcycles are there?
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