Jessica gets her favorite shade of purple paint by mixing 1/3 cup of blue paint with 1/2 cup of red paint. How many cups of blue and red paint does Jessica need to make 20 cups of her favorite purple paint?

1/3 cup of blue paint and 1/2 cup of red paint, Together this makes 5 cups of purple paint. So if we combine four of these that makes 20 cups of perfect purple paint. Four groups of 2 cups of blue paint make 8 cups of blue paint and four groups of 3 cups of red paint make 12 cups. So 20 cups of perfect purple paint contains 8 cups of blue paint and 12 cups of red paint.