There are 15 stops (including the starting point and the ending point) on a bus line. Anyone who gets on the bus at each stop will get off at each stop in the future. How many seats should there be in the car for passengers to use in order to make every passenger have a seat during driving?
2、
Zhang bought the same pencil with the same money. Li Jun asked for 13 pencils, Zhang Qiang asked for 7 pencils, and Li Jun gave Zhang Qiang 0.6 yuan money. How much is each pencil?
3、
There are stations A, B, C, D and E5 on the single-track railway, and the distance between stations is as shown in the figure (unit: km). Two trains leave from Station A and Station E at the same time. Station A is 60km/h and Station E is 50km/h. As only the station on the single-track railway has parking tracks, it is necessary to stop at the station so that the opposite train can pass.
4. A, B, C and D often do good things for the school. On Sunday, the headmaster found the big playground clean and asked the four of them:
A said, "Those who clean the playground are between B, C and D." B said, "I didn't clean the playground, but C did." C said, "There is a person between A and B who cleans the playground." Ding said, "B is telling the truth." After investigation, it was confirmed that two of the four people were telling the truth and the other two were lying. One of the four people cleans the playground. Do you know who cleaned it?
5. The clock now shows 10 hour. Then, how many minutes later, the minute hand and the hour hand coincide for the first time; How many minutes later, the minute hand and the hour hand coincide for the second time?
6, a pool, the bottom is equipped with a normally open drain pipe, the upper part is equipped with several water inlet pipes with the same thickness. Four water inlet pipes are opened, and it takes 5 hours to fill the pool; Two water inlet pipes are opened, and it takes 15 hours to fill the pool; It takes two hours to fill the pool now. How many water inlet pipes should be opened at least?
7. Mom bought 3 kilograms of apples and pears, paid 20 yuan and took them back to 7.4 yuan. How much are apples and pears per kilogram of 2.4 yuan?
8. The original first prize 1, second prize 3, third prize 5. The bonus of the first prize 1 120 yuan requires that the bonus of each first prize is twice that of each second prize, and the bonus of each second prize is twice that of each third prize. Due to temporary changes, it was changed to 3 first prizes, 3 second prizes and 3 third prizes. The total bonus amount will not change, and the multiple relationship between the bonus amounts of each award will not change. How should it be redistributed?
9. There are three cars, A, B and C, and each car runs from A to B at a certain speed. B leaves later than C 10 minutes, and catches up with C 40 minutes after departure; A leaves 20 minutes later than B, and catches up with C at 1 hour 40. How many minutes does it take for A to catch up with B after departure?
10、
Yucai Primary School has 367 students, born in 1999. How many of them are in Amanome?
1 1、
The two containers A and B contain 400 liters of water and 50% alcohol respectively. Half of the alcohol solution is poured from B for the first time, half from A after mixing, and half from B after mixing. How many liters of pure alcohol does A contain at this time?
12、
The serial number of the goods is three digits. There are five three digits: 874,765,123,364,925, and each three digit has the same number in the same place as the commodity number. So what is this three-digit number?
13、
There is a rectangular queue in the National Day military parade. One class lines up, with 3 people in a row 1 person, 5 people in a row with 2 people, and 7 people in a row with 4 people. It is known that the class size is less than 100, so there is _ _ _ _ _ _ _.
14、
Master Wang drives from place A to place B for delivery. If he drives at a speed of 60 kilometers per hour, he can get back to place A on time. However, when he arrived at location B, he found that the speed from location A to location B was only 50 kilometers per hour. If he wants to get back to location A on time, how soon should he drive back?
15、
A swindler went to the store and bought something made in 5 yuan. He paid the clerk 50 yuan, and then the clerk gave him the rest of the money. At this time, he said that he had change, so he gave it to 5 yuan, the shop assistant, and asked for the 50 yuan he had given. How much did the swindler cheat?
16、
Red, yellow, blue and white flags of different colors have 2, 2, 3 and 3 faces respectively. Randomly select three faces and line them up to represent a signal. Q: How many different signals can * * * represent? How many kinds of white flags can't be opened?
17、
The school allocated dormitories to a group of freshmen. If there are 12 people in each room, there is no room for 34 people; If each room is occupied by 14 people, four rooms will be vacant. How many dormitories are there? How many boarding students are there?
Count, there are 10- 1=9 vacancies in the middle of an orange (be careful not to put them at both ends, which means there must be a plate without oranges); Therefore, it is a different method to insert two boards in two positions of 12 vacancy.
18、
Five football teams play a single round robin game, one for every two teams. 3 points for winning a game, 1 point for drawing a game, and 0 point for losing a game. Finally, it was found that the scores of each team were different. The third place scored 7 points and tied with the first place. So what are the scores of these five teams from high to low?
19、
A thousand small cubes with a volume of 1cm are combined into a large cube with a side length of 10cm. After the surface of the big cube is painted, it is divided into the original small cubes. How many of these cubes have at least one side painted?
20、
Divide the eight numbers 14, 33, 35, 30, 39, 75, 143, 169 into two groups on average, so that their scores are equal. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _