Asweater was on sale at %40 off the regular price. ella saved $20 by buying the sweater on sale. what was the regular price of the sweater?

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