The wall in front of Xiaohua’s house is 8 meters long and 4 meters wide, and the doors and windows cover a total of 4 square meters. Now that this wall is to be painted, how many square meters is the area to be painted?
小华家前面的墙壁长8米，宽4米，其中门窗面积共有4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 - 4</gadget>
<output>28</output>

<result>28</result>