Acertain shade of green paint is made from 5 parts yellow mixed with 3 parts of blue. if 2 cans of yellow are used, how many cans of blue should be used?

Several paint mixtures are made by mixing blue paint and white paint. paint colors blue paint white paint mixture a 5 cups 12 cups mixture b 6 cups 6 cups mixture c 4 cups 12 cups mixture d 5 cups 6 cups which mixture has the highest ratio of blue paint to white paint