A classroom is 9 meters long, 6 meters wide, and 3 meters high. To paint its ceiling and walls, deduct the door and window area of 22 square meters. If 0.32 kilograms of paint is used per square meter, how many kilograms of paint are needed to paint this classroom?
一间教室长9米，宽6米，高3米，粉刷它的顶棚和墙壁，扣除门窗面积22平方米，如果每平方米用涂料0.32公斤，粉刷这间教室共需涂料多少公斤？
<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

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

<gadget id="calculator">27 + 18</gadget>
<output>45</output>

<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<gadget id="calculator">90 - 22</gadget>
<output>68</output>

<gadget id="calculator">54 + 68</gadget>
<output>122</output>

<gadget id="calculator">122 * 0.32</gadget>
<output>39.04</output>

<result>39.04</result>