The master builds 6-4 more bricks per minute than the apprentice = 2 bricks.

At the time of collection, the master built 8+8= 16 more than the apprentice.

Master-apprentice bricklaying time =(8+8)÷(6-4)

= 16÷2

=8 minutes

This brick * * * has =8×(6+4)=80 pieces.

There are 80 bricks on this floor.