Each first-class mechanic draws more pictures a day than the second-class mechanic 10M? The wall to be painted in each room is X, so the area that three first-class technicians can paint in one day is X.

8x

-50 and the area that five technicians can brush in one day is

The countable equation of 10x+40 is as follows (8x-50)/3.

-

( 10x+40)/5=

105(8x-50)

-

3( 10x+40)= 1

15040x-250

-30 times

- 120=

150 10x

=520x=52