A flat-top classroom is 8.5 meters long, 6 meters wide, and 4 meters high. The classroom doors, windows and blackboards have a total area of 27 square meters. How many square meters will be painted on the top and four walls of the classroom?
一个平顶教室长8.5米，宽6米，高4米．教室门窗和黑板的面积一共有27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">8.5 * 4</gadget>
<output>34</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">34 + 24</gadget>
<output>58</output>

<gadget id="calculator">2 * 58</gadget>
<output>116</output>

<gadget id="calculator">8.5 * 6</gadget>
<output>51</output>

<gadget id="calculator">51 - 27</gadget>
<output>24</output>

<gadget id="calculator">116 + 24</gadget>
<output>140</output>

<result>140</result>