A cuboid classroom is 8 meters long, the width is long (3/4), and the height is wide (2/3). To paint the roof and four walls, excluding the doors, windows and blackboards, the area is 20 square meters. How many square meters is the painting area?
一间长方体教室长8米，宽是长的(3/4)，高是宽的(2/3)．要粉刷屋顶和四壁，除去门窗和黑板面积20平方米，粉刷面积是多少平方米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">8 * 8 * (3/4)</gadget>
<output>48</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">8 * 8 * (3/4) * (2/3)</gadget>
<output>32</output>

<gadget id="calculator">8 * (3/4) * 8 * (3/4) * (2/3)</gadget>
<output>24</output>

<gadget id="calculator">32 + 24</gadget>
<output>56</output>

<gadget id="calculator">56 * 2</gadget>
<output>112</output>

<gadget id="calculator">112 - 20</gadget>
<output>92</output>

<gadget id="calculator">48 + 92</gadget>
<output>140</output>

<result>140</result>