Question 1036207
in one day, 5 brick layers build 1/20 of a wall, so each one does 1/100 of a wall per day.
Three brick layers at 10 days do 30% of the wall.
therefore 11 more brick layers join them and there are 14 brick layers available, each of whom can build 1/100 of the wall.  In each day, 14/100 of the wall will be done, and in 5 days, 70% of the wall will be done, finishing it.

Five days.