There are two 1-gallon (4 quarts) cans. One contains 4qt of white paint, and the other contains 3qt of red paint. You pour 1 qt of white paint into the red, mix it, and then pour 1 qt of the mixture back into the can of white paint. What is the red-white content of each can now? If you continually repeat the process, when will the two cans be the same shade of pink?