Aarav cleans 6 apartments in 2.5

if aarav cleans 30 apartments at this same rate, how long will it take him? and explain your answer

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