Given the dimensions of the walls are :
Height = 10'
The lengths = 16', 20', 16, and 20'
the gallon of paint covers 200 Sf
So, we need to find the total areas of the walls
Total area =
![(16+20+16+20)\cdot10=72\cdot10=720](https://img.qammunity.org/2023/formulas/mathematics/college/png0gkc5g9a8ohkg5id4q9b71hv3a58ugd.png)
The total area = 720 Sf
So, the number of gallons =
![720/200=3.6](https://img.qammunity.org/2023/formulas/mathematics/college/d821qsuawhlozj9tsal9oy1pap5igz7l01.png)
So, the number of gallons would the sellers to buy = 4 gallons