? According to the meaning of the question:

(x - 14)/8=(x+9 - 6)/9

? To solve this equation:

? x= 150

? There are 150 bricks in this pile.

2。 Suppose you drive an average of x kilometers per hour,

? According to the meaning of the question:

? (4 - 3.5)x=23

To solve this equation:

x=46

? A: The average speed is 46 kilometers per hour.

3。 Suppose the first pile of sand used to have x tons, and the second pile of sand used to have (x-85) tons.

According to the meaning of the question:

? x - 30=2[(x - 85) - 30]

To solve this equation:

? x=200

? x - 85= 1 15

A: The first pile of sand was originally 200 tons, and the second pile of sand was originally 1 15 tons.

4。 Set the second train to travel x kilometers per hour,

? According to the meaning of the question:

7.2x/24)=0.5X24

To solve this equation:

x=40

A: Car B is 40 kilometers per hour.

? The schematic diagram is as follows: