8 workers can load 4320 bricks in 1hour. How many workers are needed if the same amount of bricks have to be loaded in the truck in 40 minutes
Q38. In a certain brick wall, each row of bricks above the bottom row contains one less brick than the row just below it. If there are 5 rows in all and a total of 75 bricks in the wall, how many bricks does the bottom row contain?