Answer:
Well, we know that she has 2 cups of red paint and 3 cups of yellow paint left. So if she is using 1/3 of a cup of each with each batch then we know that she can make 3 batches per cup. because that would be 3/3 which = 1. So now we know that she can make 6 batches of orange before running out of red paint. She will have 1 cup of yellow paint available.
Explanation: