A wall is 8 meters long and 4 meters wide. There is a window on the wall. The area is 5 square meters. Now to paint this wall, how many square meters is the area to be painted?
一面墙壁长8米、宽4米，墙上有一窗户，面积是5平方米．现在要粉刷这面墙壁，要粉刷的面积是多少平方米？
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">32 - 5</gadget>
<output>27</output>

<result>27</result>