Nicolas is helping to paint a wall at a park near his house as part of a community service project. He had painted half of the wall yellow when the park director walked by and
said, "This wall is supposed to be painted redi" Nicolas immediately started painting over
the yellow portion of the wall. By the end of the day, he had painted 5/6 of the yellow
portion red. What fraction of the entire wall is painted red at the end of the day?