24x+ 18(35-X)=750

24x+630- 18x=750

6x= 120

x=20

35-20= 15

6. If X people go to Yunshui, there will be (2x- 1) people going to Huaguoshan.

x+(2x- 1)=200

x+2x- 1 =200

3x=20 1

x=67

Huaguoshan people: 2×67- 1= 133.

7: If the speed of A is X, then the speed of B is Y..

Equation: x+y=6

3y-3x=6

The solution is x=2 y=4.

8: If the big box X is set, the small box Y will be set.

Equation: 3x+4y= 108

2x+3y=76

The solution is x=20 y= 12.

108 Page 2: Suppose the average speed of the plane is X, then the wind speed is Y.

2 hours and 30 minutes = 150 3 hours and 20 minutes =200 minutes.

Equation:150x+150y =1200.

200x-200y= 1200

The solution is x = 7；; y= 1

3. Let the speed on the first day be X, then the speed on the second day is Y..

Equation: 4x+5y=98

5y-4x=2

X= 12 y= 10。