i am really confused on how to do this

What you have here is a classic proportion problem. We have 5oz. of orange tint for every 3
**quarts** of white.

5oz O:3qt W

We are told we will be mixing with 6 **Gallons** of White. This is a different unit of measure. We must now convert our gallon units to quarts.

1 Gallon = 4 Quarts therefore,

6 Gallon= 24 Quarts

24qt/3qt=8

We now know we have 24 quarts of white paint. Because we know we must mix 5oz of orange tint for every 3 quarts we must mix 8x 5oz or 40 oz of tint