A classroom is 8 meters long, 6 meters wide, and 3 meters high. The area of doors, windows, and blackboards is 20 square meters. Now to paint this classroom, if 0.8 kg of paint is used per square meter, how many kilograms of paint are needed in total?
一间教室长8米，宽6米，高3米，门、窗、黑板的面积占20平方米．现在要粉刷这间教室，如果每平方米用涂料0.8千克，共需涂料多少千克？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">24 + 18</gadget>
<output>42</output>

<gadget id="calculator">42 * 2</gadget>
<output>84</output>

<gadget id="calculator">84 - 20</gadget>
<output>64</output>

<gadget id="calculator">48 + 64</gadget>
<output>112</output>

<gadget id="calculator">112 * 0.8</gadget>
<output>89.6</output>

<result>89.6</result>