Olivia has a box of 20 colored tiles. There are four types of colors including black, green, white, and yellow. There are 8 black tiles, 4 green, 3 white tiles, 5 yellow tiles. Olivia will pick a tile from the box without looking, record it’s color, and put it back in the box. If Olivia does this 400 times, about how many times can she expect to pick a green tile?