The practical problems of the comparison of the first volume of the sixth grade The mid-term exam is coming soon. I heard that there are some application questions about Bi, but the teacher still doesn't talk about them. I can't understand them when I read a book. So I try to ask Baidu questions when I play computer. The examples are as follows: Duoduo's family of three and Linlin's family of four went to the restaurant for a meal. It cost 140 yuan in total. The two families decided to share the meal expenses according to the number of people. How much should each family pay? Talk about how to do the topic, don't just give the answer

The practical problems of the comparison of the first volume of the sixth grade The mid-term exam is coming soon. I heard that there are some application questions about Bi, but the teacher still doesn't talk about them. I can't understand them when I read a book. So I try to ask Baidu questions when I play computer. The examples are as follows: Duoduo's family of three and Linlin's family of four went to the restaurant for a meal. It cost 140 yuan in total. The two families decided to share the meal expenses according to the number of people. How much should each family pay? Talk about how to do the topic, don't just give the answer

According to the head count, there are always seven people, so how much does each person need to spend on average
Divide the total amount of money by the total number of people to get the average number of one person, and then multiply the average number of three people and the average number of four people to get the answer

The application question about the ratio in Grade 6

The price ratio of a and B apples is 5:4, and the mass ratio is 2:3. Now the two apples are mixed together to form a 100 kg mixed apple, and the price is 4.4 yuan / kg. What is the original price of the two apples?
Let a x yuan / kg, B 0.8x yuan / kg
（40x＋60×0.8x）÷100＝4.4
x=5
A: a 5 yuan / kg, B 4 yuan / kg

Primary school sixth grade volume I mathematics unit evaluation volume page 16 than the application of the application of scores and applications, will do a few questions to do a few questions!
1. Xiaoming, Xiaohua and Xiaojun each buy a kind of fruit for 4 yuan. The fruit Xiaoming bought weighs 4 / 5 kg, which is 2 / 5 of Xiaohua's and 3 / 5 of Xiaojun's. what fruits did they buy? (Litchi 6 yuan / kg, pear 25 yuan / kg, apple 5 yuan / 1000 g, watermelon 3 yuan / kg, banana 2 yuan / kg)
2. In a class meeting, the number of people who ask for leave is one ninth of the number of people present. In the middle of the meeting, one person asks for leave to leave. At this time, the ratio of the number of people who ask for leave to the number of people present is 3:22. How many people are there in this class?
3. According to the following information, how many megabytes of this file are left to copy? How long does it take to complete the copy
4. If a rope is folded three times to measure a well, the remaining one third of a meter will be left; if it is folded four times to measure less than one fourth of a meter, how many meters are the length of the rope and the depth of the well?

1. Xiaoming bought apples, Xiaohua bought 2kg bananas and Xiaojun bought 4kg watermelons
2. There are 50 people in this class
3. 163.2 divided by 17 / 20 - 163.2 = 28.8 m 18 divided by 17 / 20 = 17 / 360 s
4. Rope length: (1 / 3 M + 1 / 4 m) divided by (1 / 3-1 / 4) = 7 m
Well depth: 7 divided by 3 - 1 / 3 = 2m