Pat can mow 1/4 of a lawn in 20 minutes. How many hours would it take him to mow 12 lawns?
To find out how many lawns Pat can mow in an hour, we need to first calculate how many lawns he can mow in 20 minutes.
Since Pat can mow 1/4 of a lawn in 20 minutes, he can mow 1 lawn in 4 times 20 minutes, which is 80 minutes or 1 hour and 20 minutes.
Therefore, in 1 hour, Pat can mow 1 lawn/80 minutes = 1 lawn/1.33 hours = 0.75 lawns per hour.
To mow 12 lawns, it would take Pat 12 lawns / 0.75 lawns per hour = 16 hours.
Therefore, it would take Pat 16 hours to mow 12 lawns.