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There is a pile of chessmen. After they are divided into five equal parts, there are four pieces left. After three of them are divided into five equal parts, there are three pieces left. After two of them are divided into five equal parts, there are two pieces left. How many pieces are there at least? I always think that the last one should be greater than 2, so it's 184. Now it seems that no more than 2 is also in line with the meaning of the question, should be right, is 59. Liuking 123 uses arithmetic, which should be the correct answer.
Two of them were divided into five equal parts, and there were two left,
This is at least 2 * 5 + 2 = 12
Six each
Take three of them and divide them into five equal parts. Then there are three,
6 * 5 + 3 = 33
11 each
Five of them left four
11 * 5 + 4 = 59
There are at least 59 pieces in this pile
Two kinds of square brick, big brick side length 40 cm, small brick side length 30 cm, shop a room floor, with big brick shop need 90, if use small brick shop need how many? To specific formula
The area of d large square brick is 40 * 40 = 1600 square centimeter
If 90 pieces are needed, then the floor area is 1600 * 90 = 144000 square centimeters
The area of small square brick is 30 * 30 = 900 square centimeter
144000 / 900 = 160 pieces
160 small square bricks
In a math test, the average score of the first group was 84 points. Later, it was found that Li Jia's 94 points were wrongly counted as 67 points. After recalculation, the average score of the first group was 87 points. How many students are in the first group? The third grade students haven't learned the equation yet. Please answer it in a way acceptable to the third grade children
The wrong score is 94-67 = 27
Number of people = miscalculated score divided by average variable score
Number of people = 27 / (87-84) = 9
Please ask a math problem of grade three, thank you
In the eight continuous natural numbers, the sum of the largest two numbers is 998 greater than the smallest number, then the most important number
The small number is ()?
Please explain how it is calculated. Thank you
Ask octopuszy - thousand total four. Why do you say that the seventh number is six times larger than the first one? Could you tell me more about it? thank you..
The seventh number is larger than the first number 6998-6 = 992, indicating that the eighth number is 992, then the first number is 992-7 = 985
I arrange these 8 consecutive natural numbers in increasing order. If the latter number is 1 larger than the former number, then the seventh number (that is, the penultimate number) is 6 larger than the first number (that is, the smallest number). In fact, if x is set, we can see it clearly, just like another big answer
My sister's homework, urgent, the best answer to 50, not cheating!
Go home and collect two ropes of 1m and 2m in length
(1) 2 / 5 and 2 / 5 of a 1 m long rope. Which length is it? (please list the formula and explain the reason)
(2) Two fifths and two fifths of its length are measured on a 2m long rope. Which length is it? (please list the formula and explain the reason)
(3) What did you find? Please write it down
(1) 2:1 * 2 / 5 = 2 / 5m of 1m long rope is equal to 2 / 5m -------- 2:2 * 2 / 5 = 4 / 5m of 2m long rope is greater than 2 / 5m -------- 2 / 5 of 2m long rope is equal to 2 / 5m of 1m long rope
1. Cut off the cylinder with a radius of 2 decimeters and a length of 3 decimeters. How much less is the surface area and volume of the remaining cylinder? 2. Cut a rectangle with a length of 7 cm, a width of 4 cm and a height of 6 cm into the largest cylinder. How many cubic centimeters is the volume of the cylinder? 3. There are 198 hectares of wheat in a village. 90 hectares were harvested in the first five days, How many days will it take to finish the collection according to this calculation? (use proportion solution) (it should be listed and the result should be shown)
WHY
1. 2 π * 20 * 30 = 1200 π = 3768 square cm (minus 30 cm of side area)
π * (20 * 20) * 30 = 12000 π = 37680 cubic centimeter (minus the volume of a cylinder 30 cm high)
2. π 4 / 2 * (4 / 2) * 7 = 28 π = 87.92 cm3 (minimum diameter is 4cm, maximum height is 7cm)
3. 198 / x = 90 / 5 x = 11-5 = 6 (days)
1. It takes 4 hours for the master to process a batch of parts, and 6 hours for the apprentice to do it alone. Now the master and apprentice cooperate in processing, and the apprentice has processed 60 parts when they finish the task. How many parts are there in total
2. The speed ratio of car a and car B is 4:5. They start from two places at the same time and run in opposite directions. They meet several hours later. The meeting place is 60 kilometers away from car a's starting place, so as to find the distance between the two places
3. A road is 60 kilometers long, which is divided into three sections: uphill, flat road and downhill. The length ratio of each section is 1:2:3, and the time ratio of each section is 4:5:6. It is known that his uphill speed is 3 kilometers per hour. How long does it take for him to complete the whole journey
2. If the speed ratio of Party A and Party B is 4:5, the distance between the two places is 4:5, the distance between the two places is 60 / (4 / 9) = 135 km. 3. Then, the length of each journey is 10 km, 20 km, 30 km, uphill
Grade 8 (2) students are going to go out for spring outing. Both travel agency a and B offer 60 yuan per person, and both offer preferential treatment to students. Travel agency a says: 20% off for all; travel agency B says: if the number of people is less than 30, 10% off, and more than 30, 70% off
(1) Suppose the number of students in class 2 of Grade 8 is x, and the actual charges of travel agencies a and B are Y1 and Y2 respectively;
(2) Try to discuss which travel agency is the best choice
y1=0.8×60x （x＞0） y2=0.9×60x（x30）
When the number of people is less than 30, hotel a is cost-effective; when the number of people is equal to 30, hotel a is cost-effective; when the number of people is more than 30, Hotel B is cost-effective
Let's adopt it. I'm also a sophomore
A travel agency organized two tour groups A and B with a total of 80 people to travel to Suzhou and Hangzhou respectively. It is known that group A has more people than group B. what are the numbers of group A and B?
Dizzy! Must have two full company, about 38-39 people
Just arrange two 42 cars
A travel agency organized two tour groups of 80 people, the number of group A is more than twice that of group B, 5 people; how many people are there in each group? One yuan each time
The number of group B is a
2A+5+A=80
A=25
There are 55 members in group A and 25 members in group B
RELATED INFORMATIONS
- 1. A travel agency organized two tour groups A and B with a total of 80 people to travel to Lushan Mountain and Wutai Mountain respectively. It is known that the number of group A is more than two times that of group B, with 5 people B what are the numbers of the two tour groups?
- 2. A and B go from a to B at the same time. When a goes to B, they immediately return and meet B 32 kilometers away. The speed ratio of a and B is 5:4. How many kilometers did B travel when they met?
- 3. Callia and Xuanxuan each have some cartoon stickers. If callia gives Xuanxuan 25 stickers, Xuanxuan's stickers will be three times as much as callia's. If Xuanxuan gives callia some stickers, callia's stickers will be six times as much as Xuanxuan's. how many stickers can Xuanxuan have at least?
- 4. By bus, 40% of the total number of passengers get off the bus, and another 9 people come up. This is one twentieth more passengers than before. How many people are there in the bus? The clothing store buys 100 sets of sportswear, each of which costs 200 yuan, and sells them at a price of 50% of the expected profit. When 60% of the sportswear is sold, the rest of the sportswear is sold at a discount. After 100 sets of sportswear are sold out, the expected profit is reduced by 18%. How much discount is the clothing sold
- 5. The opposite number of A-B is () A. a+bB. -（a+b）C. b-aD. -a-b
- 6. Lele supermarket carries out promotional activities, drinks "buy ten get one free". A bottle of coke is 6 yuan, Xiaohong buy 45 bottles of coke, how much do you have to pay?
- 7. A beverage store is engaged in sales promotion, so you can get one free for four drinks. The current price of a bottle of coke is 0.6 yuan lower than the original price. How much is the current price of this bottle of coke,
- 8. There is a peach tree behind Uncle Wang's house. His naughty grandson picks some peaches from the tree every day and shares them with his neighbor's friends. On the first day, he picks one tenth of the total number of peaches. On the next eight days, he picks 19, 18, 17 After nine days of picking, there are still 10 peaches left on the tree. How many peaches are there in the tree?
- 9. The monkey mother picked 17 peaches and gave them to three baby monkeys, 1 / 2 to Dabao, 1 / 3 to Erbao and 1 / 9 to Sanbao. How many peaches should each baby monkey give?
- 10. The monkey mother picked 17 peaches for her children to eat. The big monkey said it would get 3% of the total, the second monkey would get 2% of the total, and the little monkey would get 3% The mother monkey asked the three monkeys not to cut the peaches apart. Do you have any good idea?
- 11. Go to the park with friends To be simple, I use it for speech in my class. I just say what I played in the morning and what I played in the afternoon
- 12. The 59 students in the class went to the park and rented 17 bicycles for 3 people and 4 people. The class was just full. How many bicycles for 3 people and 4 people?
- 13. This new year's Day party host our class has me, I do not know what to say! If five people have a good answer, I will increase the reward
- 14. There are three rooms and double rooms in the room department of a hotel
- 15. There are three rooms and double rooms in a hotel. The charging standard is as follows: yuan / room · day, 210 for three rooms and 180 for double rooms 【1】 If three of the seven individual guests live in a three person ordinary room and four in a double room, and each room is just full, how much is the total accommodation fee for these seven people per day? 【2】 In order to attract tourists, a 50% discount for group stay is implemented. During the period of a 50 person travel discount, the group will stay in the four hotels and live in some ordinary rooms for three people and ordinary rooms for two people. If each room is just full and a total cost of 2070 yuan is spent on one day, how many ordinary rooms for three people and ordinary rooms for two people will the group live in? Equation of one degree with one variable!
- 16. There are three rooms and double rooms in the room department of the hotel. The charge data is shown in the table below. In order to attract tourists, 50% discount for group stay is implemented. A 50 person hotel is available During the discount period, the tour group stayed in the hotel and stayed in some three person ordinary rooms and two person ordinary rooms. If each room is just full and the total cost of accommodation is 1510 yuan per day, how many three person ordinary rooms and two person ordinary rooms did the tour group stay in? The first is the ordinary version, and the second is the luxury version
- 17. A hotel room department has 3 rooms, double room, charge
- 18. A tourist group stays in a hotel. If there are five people in each room, there are four people who have no place to live. If there are six people in each room, there is only one room with four people and three rooms vacant Find the number of rooms and the number of the tour group. Use the quadratic equation to do the application solution
- 19. How many rooms are there in a tourist group? How many people are there in a tourist group?
- 20. There are 35 male tourists, a quarter more than female tourists. How many female tourists are there