human
If Raymond does half as much laundry as Sarah, and Sarah does 4 times as much laundry as David, calculate the difference in the amount of laundry Raymond and David do if Sarah does 400 pounds of laundry.
assistant
How much laundry does Raymond do? ** If Sarah does 400 pounds of laundry, and Raymond does half as much laundry as Sarah, Raymond does 1/2*400 = 200 pounds of laundry.
How much laundry does David do? ** Sara also does 4 times as much laundry as David, meaning David does 400/4 = <<400/4=100>>100 pounds of laundry.
How much is the difference in the amount of laundry Raymond and David do? ** The difference in the amount of laundry Raymond and David do is 200-100 = <<200-100=100>>100 pounds
#### 100