You mix 1/4 cup of red paint for every 1/2 cup of blue paint to make 3 gallons of purple paint. you decide that you want to make a lighter purple paint. you make the new mixture by adding 1/4 cup of white paint for every 1/4 cup of red paint and 1/2 cup of blue paint. how much red paint, blue paint, and white paint do you use to make 1 1/2 gallons of the lighter purple paint?