Answer:
84 cups
Explanation:
We have 20 packs, with each having 4 cups of paint. To find that total, we multiply 20 by 4: 20 * 4 = 80 cups.
We see that they need another 1 pack, which also has 4 cups of paint. So, we multiply 1 by 4: 1 * 4 = 4 cups.
Then we add the two totals together: 80 + 4 = 84 cups.
The answer is 84 cups.
Hope this helps!