Eric spent 2 hours removing wallpaper from just 1 wall of his 4 walled dining room.  He also needs to remove wallpaper from his 4 walled living room.  How many hours will it take him to remove the remaining wallpaper?
His dining room is 4 walls and he has already removed 1 wall of wallpaper so that leaves 4-1 = 
<gadget id="calculator">4-1</gadget>
<output>3</output>
3 walls in the dining room.
He has 3 walls left in the dining room and 4 in his living room for a total of 3+4 = 
<gadget id="calculator">3+4</gadget>
<output>7</output>
7 walls.
It takes 2 hours to remove wallpaper from just 1 wall and he has 7 more to go so it will take him 2*7 = 
<gadget id="calculator">2*7</gadget>
<output>14</output>
14 hours.

<result>14</result>