A classroom is 8 meters long, 6 meters wide, and 4 meters high. Now it is necessary to paint the surroundings and the roof of the classroom. If the area of doors and windows is 20 square meters, if 250 grams of paint is required per square meter, how many kilograms of paint is required?
一间教室长8米，宽6米，高4米，现在要粉刷教室的四周和屋顶，扣除门窗面积20平方米，如果每平方米需涂料250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 - 20</gadget>
<output>92</output>

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

<gadget id="calculator">250 / 1_000</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">140 * (1/4)</gadget>
<output>35</output>

<result>35</result>