Each wall of a 3 sided shower has 8 tiles running the width of the wall and 20 tiles running the height of the wall. How many tiles are in the shower? Think carefully first, then make a decision:
There are 8 tiles along the width and 20 tiles along the height for a total of 8 * 20 = 160 tiles. Each wall has 160 tiles and there are 3 walls so there are 160 * 3 = 480 tiles in the shower. So, the answer is 480.