classroom is 8 meters long, 6 meters wide, and 4 meters high. To paint the ceiling and surrounding walls of the classroom, remove the doors and windows of 23 square meters. If 0.2 kilograms 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4米．要粉刷教室的天花板和四周墙壁，除去门窗23平方米．如果每平方米用涂料0.2千克，共需涂料多少千克？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">6 * 4</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 - 23</gadget>
<output>89</output>

<gadget id="calculator">48 + 89</gadget>
<output>137</output>

<gadget id="calculator">137 * 0.2</gadget>
<output>27.4</output>

<result>27.4</result>