A painter has a gallon tin (eight pints) full of yellow paint and another gallon tin half full of blue paint. He wants to mix the paints together so he can paint a room green. He reckons he will need at least 10 pints of paint to cover the walls. Unfortunately, he doesn't have a mixing vessel large enough to hold all the paint - the only other container he has, besides the tins, being a pint glass. Is it possible for the painter to mix the paint correctly using just these containers? What is the quickest method he can use?