All the guests came to this shop,
Seven guests in a room, more than seven guests,
A room with nine guests and an empty room,
How many guests and rooms are there?
Solution: there are x guests and y rooms, and the equations are obtained.
7y+7=x
9(y- 1)=x gives y=8 x=63.
A: There are 63 guests and 8 rooms.
Analysis: the invariants in the problem are the number of guests and rooms, so let these two quantities be unknowns X and Y, and we can get a binary linear equation group, and solve the equation group by elimination method.
The magnificent ancient temple is in the mountains. I wonder how many monks there are.
364 bowls, see if they are used up.
Three people eat a bowl of rice and four people eat a bowl of soup.
Excuse me, sir, how many monks are there in the temple?
Suppose there are actually x people.
X/3+X/4=364
X=624
That is * * there are 624 people.
3. Li Bai is walking in the street, playing with wine with a pot.
Double it when you meet a store, and have a drink when you see flowers.
I met the shop flower three times and drank all the wine in the pot.
How much wine is there in the pot?
Suppose there is wine x, because I met shops and flowers three times and drank all the wine in the pot.
So there is {(x * 2-2) * 2-1} * 2-1= 0.
You can get X=7/8.