There were originally a passengers on the bus, B passengers on the way down and 3 passengers on the way up. Now there are () passengers on the bus

There were originally a passengers on the bus, B passengers on the way down and 3 passengers on the way up. Now there are () passengers on the bus

There are A-B + 3 passengers

There were 36 passengers on the bus. At the next stop, some of them got off and 11 of them got on. Now there are 40 passengers on the bus. How many of them got off?
Using equation

Let's go down to x people. 36-x + 11 = 40 36 + 11-x = 40 47-x = 40 - x = 40-47 - x = - 7 x = 7 answer: go down to 7 people

When a bus goes to Xinhua Road station, it gets off 2 / 5 and comes up 6 people. Now the passengers on the bus are 3 / 4 of the original number. How many people are the original passengers on the bus?

Two fifths of the people got on and off the car, and the remaining three fifths. After six people got on the car, they became three fourths. This shows that the six people on the car are three fourths of the total number of people on the original car. Therefore, there are 40 people on the original car

There used to be 42 passengers on a bus. After arriving at Nanmen station, several people got off, and another 9 people came up. At this time, there were 47 passengers on the bus
How many people have stood down at the south gate

Set up the south gate to stand down x people
Original number of people - number of people going down + number of people going up = number of people now
42-X+9=47
X=42+9-47
X=4
Go down, four people