A classroom is 8 meters long, 6 meters wide, and 3 meters high. Now it needs to paint its walls and ceiling with paint. If 24 square meters of doors, windows and blackboards are deducted, how big is the area required to be painted? If 0.15 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，现在要用涂料粉刷它的四壁和顶棚．如果扣除门、窗和黑板24平方米，求要粉刷的面积有多大？如果每平方米用涂料0.15千克，一共需要多少千克涂料？
<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 - 24</gadget>
<output>60</output>

<gadget id="calculator">48 + 60</gadget>
<output>108</output>

<gadget id="calculator">108 * 0.15</gadget>
<output>16.2</output>

<result>16.2</result>