Answer:
1 2/3 cups
Step-by-step Explanation:
If Jacob uses 1/3 cup of yellow paint for every 1/5 cup of blue paint to make green paint.
If he needed one cup of blue paint he would have to get 5, 1/5 cups for get a full cup.
So if he needed 1/3 cup of yellow paint for every 1/5 cup of blue paint he would also need to get 5, 1/3 cups of yellow paint. Which would leave him with 5/3 cups of yellow paint, which simplifies to 1 2/3 cups of yellow paint and 1 cup of blue paint.