![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Xiaogang starts from home every morning. It takes 9 minutes to eat breakfast in the morning market 200 away. Then it takes 18 minutes to walk 400 meters to school. After school in the afternoon, Xiaogang takes 23 minutes to walk 500 meters home. How many kilometers does Xiaogang walk from school to home? What's the average speed?
200 + 400 + 500 = 1100 (m) = 1.1km
1100 / (9 + 18 + 23) = 1100 / 50 = 22 (M / min)
Xiao Gang goes to school from home. If he walks 50 meters per minute, he will be one minute late. If he walks 60 meters per minute, he will be two minutes early. He asks for the journey from home to school
It takes X minutes to get to school
50(x+1)=60(x-2)
The solution is x = 17
S = VT = 50x17 = 850 (m)
A: Xiaogang's journey from home to school is 850 meters
The distance from Xiaogang's home to school is 3000m. He starts from home at 7:30 in the morning and goes to school by bike. The speed of cycling is 157m / min,
Can he get to school before 8 o'clock?
3000 △ 157 ≈ 19 (min)
7: 30 plus 19 is 7:49,
So, he can get to school before 8 o'clock
One day, the ratio of the number of cars and horses crossing the river is 2:9, and the number of horses is 37 of the number of people. A total of 945 yuan has been received. What are the number of cars, horses and people on that day?
37 = 3:7, because the ratio of the number of horses crossing the river to the number of people is 3:7 = 9:21, and the ratio of the number of chariots and horses crossing the river is 2:9:21, so the ratio of the number of chariots, horses and people crossing the river is 2:9:21. Because 2 × 3 = 6, 9 × 2 = 18, 21 × 1 = 21, the total price ratio of chariots, horses and people crossing the river is 6:18:21 =
One day, the ratio of the number of cars and horses crossing the river is 2:9, and the number of horses is 37 of the number of people. A total of 945 yuan has been received. What are the number of cars, horses and people on that day?
37 = 3:7, because the ratio of the number of horses crossing the river to the number of people is 3:7 = 9:21, and the ratio of the number of chariots and horses crossing the river is 2:9:21, so the ratio of the number of chariots, horses and people crossing the river is 2:9:21. Because 2 × 3 = 6, 9 × 2 = 18, 21 × 1 = 21, the total price ratio of chariots, horses and people crossing the river is 6:18:21 =
The charge for a call from a public phone booth is 0.5 yuan for less than 3 minutes, and 0.2 yuan per minute for more than 3 minutes. Xiao Li will pay you at this phone booth
Mother in Guangzhou, the call time is 8 minutes and 25 seconds, how much does Xiao Li pay
8-3 = 5 (minutes) is how much time is exceeded 5 * 0.2 = 1 (yuan) 1 + 0.5 = 1.5 yuan
Xiao Li can jump 83 times in one minute, and her brother can jump 273 times in three minutes. How many times does her brother jump more than Xiao Li in one minute?
Answer: brother jumps 8 times more than Xiao Li in one minute
Xiaoqiang plans to use 31 yuan to buy the following three kinds of ball point pens, 2 yuan. 3 yuan. 4 yuan, at least one for each. How many can he buy at most, at least?
You can buy 14 pieces at most. According to the price, they are 12 pieces, 1 piece and 1 piece. I don't know what you mean at least. I'll give you three pieces, one for each
Xiao Lin bought a ballpoint pen and a pen for 12 yuan. The unit price of a ballpoint pen is 15 times that of a pen______ Yuan
12 (1 + 15), = 12 × 56, = 10 (yuan); 10 × 15 = 2 (yuan); answer: a ballpoint pen is 2 yuan
Xiao Li bought a ballpoint pen and a pen, shared 12 yuan, the unit price of ballpoint pen is 1 / 5 of the pen, how much is the unit price of ballpoint pen and pen?
Determinant
It is necessary to make a formula to explain what kind of problem this is
Suppose a ballpoint pen costs X Yuan and a pen costs 5x yuan
Then x + 5x = 12
The solution is x = 2
So a pen is 10 yuan and a ballpoint pen is 2 yuan
I don't know what kind. Sorry
RELATED INFORMATIONS
- 1. Xiao Ming made a local call for six minutes, and then made a long-distance call. The total cost was 2.10 yuan. What's the talk time of the long-distance call 20 yuan for the first three minutes of a local call, and 0. 10 yuan for each subsequent call. 0
- 2. Typical problems in practical engineering problems For a project, it takes 20 days for team a to do it alone, and 12 days for team B to do it alone. It is known that team a has done the project for several days, and then team B has continued to complete it. It takes 14 days from the beginning to the completion, so how many days did team a do it first? How many days did Team B do it again?
- 3. When I solve the applied problems of mathematical engineering problems, I know the equivalent relation, but I can't make equations. What should I do?
- 4. For a project, it takes a day for Party A to finish it alone, and it takes B day for Party B to finish it alone. For Party A and Party B to cooperate for 5 days, how many parts of the project can be completed? Regard the project as unit 1
- 5. 1、 It is only a formula, not a calculation 1. The third grade students plant trees. There are 50 students in the first class, with an average of 3 trees per person. There are 55 students in the second class, with a total of 165 trees. How many trees per person in the third grade? 2. Mr. Wang deposits 5000 yuan in the bank for three years at an annual interest rate of 2.4%. When it comes to maturity, how much is the total amount of principal and interest after deducting the interest tax (20%)? 3. Mingmingjia plans to spend 800 yuan in May, but the result is 950 yuan. How much is the overrun? 4. The price of a garment will be 80 yuan after 20% price reduction. How much is the original price? 7. The income of wheat in Jingcheng Township this year is 5% higher than that of last year, just 60 tons higher than that of last year. How many tons of wheat in Jingcheng Township last year? 2、 Practical questions 1. The fruit shop has 1500 kg of fruit, and the pear is three fifths of the apple, and the pear is three fourths of the peach. How many kg are the peaches? 2. The number of goats is 200 less than that of sheep. The number of goats is 60% of that of sheep. How many goats and sheep are there respectively 3. In one way, team a and team B cooperate for 10 days, and team a can complete it by himself for 30 days. After 4 days of cooperation, team a is taken away because of something, and the rest is completed by team B. how many days will it take team B to complete the task?
- 6. If 3 / x = 1 / y = 4 / Z and XY + XZ + YZ = 76, find the value of 2 (square of x) + 12 (square of Y) + 9 (square of Z) Although it does seem wordy, you can still understand it if you look at it carefully,
- 7. Summer homework of mathematics in grade one of junior high school 1. The square of X + the square of Y - 8x - 10Y + 41 = 0, find the value of X / y + Y / X 2. Square of X + square of Y - 6x - 4Y + 13 = 0, find the value of (x + y) to the power of 2008
- 8. Write a paragraph under the title of "what is happiness", within 150 words
- 9. Fifth grade volume two summer vacation study companion p135 wide angle ability, such as the topic The second question has a cuboid, 24 long, 12 wide and 6 high (unit: cm). Now cut it into two identical cuboids. The third question: how many square centimeters can the surface area increase at most?
- 10. Happy summer vacation I counted more than 20 horses
- 11. In Xiaogang's Bank, there are 20 2-cent and 5-cent coins, totaling 7.6 yuan. How many 2-cent coins are there?
- 12. Xiao Gang has several pieces of RMB 5 yuan and RMB 2 yuan. She wants to take out 43 yuan. How many different ways are there? (list all the ways)
- 13. Xiao Ming and his father go to the park to play. Xiao Ming wants to make a plane. Today is children's day. Xiao Ming has half a ticket. His father paid 20 yuan in total and recovered 2 yuan. How much is the ticket price for Xiao Ming and his father
- 14. Xiao Ming's wall clock is slow every hour. At 8 a.m., Xiao Ming sets the clock at the standard time. At 12 noon, what's the standard time?
- 15. For a two digit number, its ten digit number plus seven times of the one digit number is still equal to the two digit number. Such a two digit number has () A. One B. two C. three D. four
- 16. A question about using the successive difference method to calculate acceleration Can I use a = (x6 + X4 + x2-x5-x3-x1) / 3t2 to calculate the acceleration? Can I use all the data?
- 17. The conclusion of the experiment of measuring the acceleration of the car with the clock
- 18. When is the first time that the hour hand and the minute hand coincide?
- 19. The length of the hour hand of a clock is 14 cm. After a day and a night, how many cm is the distance that the point of the hour hand passes
- 20. If the clock strikes at every hour, the number of times it strikes is equal to the number of the clock points, and it strikes at every half hour, then the clock strikes day and night______ Next