Final answer:
Caleb will need 20 cups of blue paint and 20 cups of yellow paint to make 40 cups of green paint, assuming a 1:1 mixing ratio for blue and yellow to make green.
Step-by-step explanation:
Caleb needs 40 cups of green paint to paint his room. To make green paint, he will need to mix blue and yellow paint in equal proportions. Since green is made by mixing these two primary colors, we assume a 1:1 ratio for simplicity.
To find out how many cups of each color Caleb will need, we simply divide the total amount of green paint needed by 2 (since the ratio is 1:1).
40 cups of green paint ÷ 2 = 20 cups of blue paint
40 cups of green paint ÷ 2 = 20 cups of yellow paint
Therefore, Caleb will need 20 cups of blue paint and 20 cups of yellow paint to mix together to create 40 cups of green paint.