human
Carla needs to dry-clean 80 pieces of laundry by noon. If she starts work at 8 AM, how many pieces of laundry does she need to clean per hour?
assistant
How many hours does Carla have to work? ** First find how many hours Carla has to work: 12:00 - 8:00 = 4 hours
How many pieces of laundry does Carla need to dry-clean per hour? ** Then divide the total amount of laundry by the number of hours to find how many pieces Carla has to clean per hour: 80 pieces / 4 hours = <<80/4=20>>20 pieces/hour
#### 20