1, the sum of three consecutive natural numbers is 99, and the middle number is X. Can you make an equation to find the value of X? What are the other two numbers? Fragrance and radiation protection

2. There are two packaging specifications for a beverage. The capacity of a large bottle is 1.5 liter, which is three times that of a small bottle. The unit price of small bottles is 1.8 yuan, which is cheaper than that of large bottles. What is the capacity of a small bottle? What is the unit price of the big bottle?

Teacher Wang distributed 25 compositions and 39 math books to the students in the first group on average. The result is 1 composition, 3 math books. How many students are there in the first group at most?

4. A rectangular piece of paper, length16cm, width12cm. If you cut it into squares of the same size, how many squares can you cut it? What is the side length of each square?

5. Students in a class have more than 3 people in 7 rows and less than 4 people in 8 rows. What is the minimum number of students in this class?

6.5 class (1) students do the questions. Row 8 is missing 1 person, 10 is missing 1 person. How many people are there in this class at least?

7.12m Use 20m rope for the first time and full length for the second time. What fraction of the full length is used for the first time?

8. A hotel moved 5 cases of beer and 60 bottles of beer, which were distributed to 4 tables on average. How many boxes are each table divided into? How many bottles per table on average?

9. A pile of coal ***5 tons, shipped in 8 times. How many tons per shipment on average? What is the average weight of each batch of 5 tons?

1 1. The cinema has 24 seats in one row. Mother took her daughter to the movies, and mother and daughter sat together. How many different sitting positions are there in the same row?

12 and 100 kg of peanuts can squeeze out 35 kg of peanut oil. How many kilograms of peanut oil can be squeezed out per kilogram of peanut on average? How many kilograms does it take to squeeze out 1 kg peanut oil?

13, Li, Wang and Chen made similar parts. Li Shifu made three in four hours, Master Wang made seven in 10 hour and Master Chen made 17 in 20 hours. Who does it faster?

14 As the saying goes, "shop around", Xiao Min went to the wholesale market to buy pencils, ran three booths in a row, and found that booth A 5 yuan bought eight; B spread 5 to 3 yuan; At booth C, 7 yuan buys 8 for 2. Please help Xiao Min find out which one should choose the cheaper purchase.

15. The same towel is priced at 3 in 5 yuan in Supermarket A, 4 in 7 yuan in Supermarket B and 5 in 8 yuan in Supermarket C. Which supermarket is the cheapest for this towel? Which supermarket is the most expensive?

16. Three people are reading a 240-page book. A has not seen it, b has not seen it, and c has not seen it. Who reads the most pages?

17, Wang, Zhang and Li work in the same workshop. Master Wang makes 10 in 3 hours, master Zhang makes 12 in 4 hours, and makes 16 in 5 hours. How long does it take each person to make a part on average? Who is the most efficient?

19, two cars go from a to b at the same time, and the queue is completely long. A car needs 10 hour, and B car needs 15 hour. Two hours later, what fraction of the total length are the two cars apart?

20. The master and the apprentice made a batch of parts together. After the master finished this batch of parts, how many more parts did the master make than the apprentice?

2 1, a piece of iron is 4 square meters. After the first cut and the second cut, how much iron sheet is left?

22. A ribbon runs out of rice, and the rest is longer than the used rice. How many meters is this belt?

23, a pile of 30 tons of yellow sand, a car can transport every time, b car can transport every time, how many fractions can two cars transport each time?

24. The air-conditioning factory completed the annual planning task in the first half of last year, and the same number was completed in the second half and the first half of last year. How much did the air-conditioning factory actually exceed the annual planned task last year?

25. Uncle Zhang collected several tons of watermelons and sold them on the first day and the next. How much is left?

26. Li Guang Agricultural Machinery Factory completed the annual task in the first half of last year and the annual task in the second half. How many points are beyond the annual plan?

27. A hectare of land is planted with soybeans and cotton, and the rest is planted with corn. What is the proportion of corn planted in this land?

29. A rectangle and a circle have equal perimeters. It is known that the length of a rectangle is 10 cm and the width is 5.7 cm. What is the area of a circle?

As shown in the figure, cut the largest right triangle from a semicircular steel plate with a diameter of 4 decimeters. What is the area of this triangle?

40. There is an oil drum with a diameter of 60 cm, which rolls from one side of the foot of the wall to the other. The width of the warehouse is10.02m.. How many times do you need to roll?

46. The minute hand of the big clock on the roof of the hotel is 0.6 meters long, so how many decimeters did the needle tip of the minute hand walk from noon 12 to 3 pm?

47. Uncle Zhang crossed a bridge with a length of 1099 meters by bike. Given that the outer diameter of the wheel is 70 cm, how many turns will the wheel make when crossing the bridge?

48. Round fish pond, perimeter 1 88.4m, now widened1m.. How many square meters is the widened area?

49. Around a circular flower bed with a diameter of16m, there is a gravel road with a width of 2m. What is the area of this gravel road?

50. The circumference of a semicircle is 30.84 decimeters. How many square decimetres is the area of this semicircle?

5 1. After dividing a circle into several equal parts, it can be made into a rectangle with a circumference of 20.7 decimeters. What is the square decimeter of this circle?

52. The radius of the outer wheel of a bicycle is 40 cm. How many turns does it take for a wheel to cross a street1256m long?

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