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?
There are 8 tiles along the width and 20 tiles along the height for a total of 8*20 = 
<gadget id="calculator">8*20</gadget>
<output>160</output>
160 tiles.
Each wall has 160 tiles and there are 3 walls so there are 160*3 = 
<gadget id="calculator">160*3</gadget>
<output>480</output>
480 tiles in the shower.

<result>480</result>