A classroom is 8 meters long, 6 meters wide, and 4 meters high. To paint the top and four walls of the classroom, the area of doors and windows is 22.4 square meters. If 200 grams of lime is used per square meter, how many kilograms of lime are needed in total?
一个教室长8米，宽6米，高4米．要粉刷教室的顶和四壁，除去门窗面积22.4平方米．若每平方米用石灰200克，一共需要石灰多少千克？
<gadget id="calculator">6 * 8</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">48 + 32 + 24</gadget>
<output>104</output>

<gadget id="calculator">104 * 2</gadget>
<output>208</output>

<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">208 - 48 - 22.4</gadget>
<output>137.6</output>

<gadget id="calculator">200 / 1_000</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">137.6 * (1/5)</gadget>
<output>27.52</output>

<result>27.52</result>