2. Four students, A, B, C and D, took part in the Olympic Mathematical Examination. A got 74 points, B got 86 points and C got 96 points. The average score of the four students is exactly an integer. How many points can a D get?
3. In □× 5 ÷ 3× 9+11=1991,the number to be filled in is ().
4. There are two red flags and 1 blue flag. These flags have the same size and shape. Hang these flags on the flagpole to make various signals, and each flag is arranged at a certain interval. How many different signals can these flags express?
5, a basket of apples, if divided equally to 4 children, 3 more apples; If you divide it equally among five children, there will be four more apples; If it is distributed to six children on average, there will be less 1 apple. There are at least () apples in this basket.
6. The distance between Party A and Party B is 360 kilometers, and buses and trucks leave from Party A for Party B at the same time. The speed of the truck is 60 kilometers per hour and the speed of the bus is 40 kilometers per hour. After the truck arrives at the second place, it stays for 0.5 hours and returns to the first place at the original speed. A few hours after starting from the first place, the two cars met.
7. A number is divided by more than 2 by 3, more than 3 by 4, and more than 4 by 5. The minimum number is ()
8. Greening workers planted a tree every 4 meters on both sides of a section of highway, and planted 74 trees in a row. Now we must plant a tree every 6 meters. How many trees don't need transplanting?
9. Students from Class 5 (4) of Binhai Experimental Primary School went for a picnic. When eating, every two people have a rice bowl, every three people have a vegetable bowl and every four people have a soup bowl. A total of 65 bowls are used. How many students are there in this class?
10. The telephone charges of a county are as follows: 0 ~ 3 minutes in 0.2 yuan, more than 3 minutes, the excess is calculated at 0./kloc-0 yuan per minute (less than 1 minute is calculated at 1 minute), and Xiaojun calls the county for 7 minutes and 35 seconds to calculate the telephone charges.
1 1 There are 60 fifth-grade students in Hope Primary School, including 47 girls. What percentage of students in this grade are male and female respectively?
12. A book with 120 pages, Xiao Ming read 3 1 page on the first day and 4 1 page on the second day. How many books does Xiaoming read every day? If you read all the rest on the third day, how many parts of the book did you read on the third day? What should be the total score of reading in three days?
13. There are 120 books in the book corner, including 30 composition books and 40 story books. How many composition books are there? What other math questions can I ask?
14. The circumference of the isosceles trapezoid steel plate is 30cm, the waist is 6cm, the height is 4cm, and the weight of * * * is 2700g. How many grams does it weigh per square centimeter on average?
15. Lingling processed a cube with a side length of 8 cm into a cuboid with a width of 4 cm and a height of 2 cm. What is the length of this cuboid?
16. The height of the cuboid is reduced by 2cm (the bottom is unchanged) to obtain a cube, and the surface area of the cuboid is reduced by 24cm. What is the volume of this cuboid?
17。 Four cows and Sanma eat 90 kilograms of grass every day, and eight cows and two horses eat 140 kilograms every day. How much Jin does each cow and horse eat every day?
18. There are two classes in the fifth grade of Baihui Primary School. When four students transfer from (1) class to (2) class, the number of students in the two classes is equal. Originally, the number of class (2) was 2 1/25 of class (1). How many students are there in Class (1) and Class (2)?
19. There is a peach tree on the top of the mountain. A monkey eats peaches. On the first day, he ate a tenth. In the next two days, he ate one-ninth and one-eighth of the existing peaches, leaving 70 peaches on the tree. How many peaches are there on the tree?
20. The TV factory produced an average of 1.25 million TV sets in the first two quarters of last year, and 1.25 million TV sets in the last two quarters. It is known that TV sets 1 15000 were produced in the first quarter. Q: How many TV sets did * * produce in the second, third and fourth quarters?
It takes 80 seconds for a train to cross a 456-meter-long bridge and 77 seconds to cross a 399-meter-long tunnel at the same speed. Find the speed and circumference of the train
2 1. When a number is divided by a number, the quotient is greater than 5 0.5, the dividend is expanded three times, and the quotient is greater than 178 0. 1. What should the dividend be? (Formula or equation)
22。 A barrel of oil weighs 5.6 kg, and the barrel weighs 3. 1 kg after removing half of the oil. How much does this bucket weigh? (Formula or equation)
23. In a subtraction formula, the sum of the minuend, the minuend and the difference = 14.82, and the minuend is three times the difference, so the minuend =?
24. The school bought 45 ping-pong balls and 15 badminton balls and took them to 45 yuan. A badminton can buy three ping-pong balls. What is the unit price of table tennis and badminton?
25. The sum of numbers A, B, C and D is 7 1, and A+2 = B-3 = C X2 = D 1. What are their four numbers?
26. 1. The teacher put 3 1 pieces in five bags respectively. No matter how many pieces the child asks the teacher (no more than 3 1 piece), the teacher only needs to take out 1 piece or several bags, which is exactly the number of pieces the child wants. How many of these five bags are there?
27. There are four piles of balls with the same appearance, four in each pile. It is known that three piles are genuine and one pile is defective. Each quality ball weighs 10g, and each quality ball weighs11g.. Please weigh it with a balance and find out the defective pile.
28. There are 27 balls with the same appearance, and only one ball is defective, which is lighter than the genuine one. Please weigh it with the balance only three times (no weight) to find out the defective ball.
29. According to 10 balls with the same appearance, only one ball is defective. Please weigh it three times with the balance to find out the defective products.
30. There are 12 balls with the same appearance, and only one ball is defective. Only use the balance to weigh it three times. Can you find out the defective products?