Answer: 16.1 ounces per minute
Step-by-step explanation:
in 7 days, he painted by 4 hours each day, so we have a total of 28 hours.
In a hour we have 60 minutes, so we have a total of:
28*60 = 1680 minutes.
He used 211 gallons, and knowing that 1 gallon is 128 ounces, then 211 gallons is:
211*128 ounces = 27,008 ounces.
Then the ounces dispensed each minute are:
R = 27,008/1680 ounces per minute = 16.1 ounces per minute