Lucille is painting her room. Two of her walls are 3 meters wide and 2 meters tall. The third wall is 5 meters wide and 2 meters tall. The final wall is 4 meters wide and 2 meters tall. If each can of paint covers 2 square meters, how many cans of paint does Lucille need?
For the first set of walls, each wall covers 3 meters wide * 2 meters tall = 
<gadget id="calculator">3*2</gadget>
<output>6</output>
6 square meters.
There are two of these walls, so this becomes a total of 6 meters * 2 walls = 
<gadget id="calculator">6*2</gadget>
<output>12</output>
12 square meters.
The third wall covers 5 meters wide * 2 meters tall = 
<gadget id="calculator">5*2</gadget>
<output>10</output>
10 square meters.
The final wall covers 4 meters wide * 2 meters tall = 
<gadget id="calculator">4*2</gadget>
<output>8</output>
8 square meters.
So in total, the paint needs to cover 12 + 10 + 8 = 
<gadget id="calculator">12+10+8</gadget>
<output>30</output>
30 metres.
Since each can covers 2 meters, Lucille needs 30 meters / 2 = 
<gadget id="calculator">30/2</gadget>
<output>15</output>
15 cans of paint.

<result>15</result>