If it takes 20 minutes to paint a house, how many houses can you paint in 3 hours?
How many minutes are in 3 hours? ** There are 3 hours * 60 minutes/hour =<<3*60=180>>180 minutes in 3 hours
How many houses can you paint in 3 hours? ** You can paint 180 minutes / 20 houses/minute = 9 houses in 3 hours.
#### 9