5x- 1000=x

x=250

So Uncle Wang lost 250 yuan.

Solution: the powder area of each room is x square meters, and the equation can be listed.

(8x-50)/3-( 10x+40)/5 = 10

x=52

(8x-50)/3= 122

( 10x+40)/5 = 1 12

Therefore, each first-class mechanic and second-class mechanic can brush the walls of 122 and 1 12 square meters every day.

Solution: countable equation

1.5x=3.5(x-5)

x=8.75

So it turns out that it takes 8.75 minutes to go home from school by car.