Our classroom is 8 meters long, 7 meters wide and 4 meters high. The classroom doors, windows and blackboards have a total area of 35.8 square meters. How many square meters will be painted on the top and four walls of the classroom?
我们的教室长8米，宽7米，高4米．教室门窗和黑板的面积一共有35.8平方米．要粉刷教室的顶面和四面墙壁，粉刷的面积有多少平方米？
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<gadget id="calculator">32 + 28</gadget>
<output>60</output>

<gadget id="calculator">2 * 60</gadget>
<output>120</output>

<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<gadget id="calculator">56 - 35.8</gadget>
<output>20.2</output>

<gadget id="calculator">120 + 20.2</gadget>
<output>140.2</output>

<result>140.2</result>