A classroom is 9 meters long, 6 meters wide, and 4 meters high. If you paint its roof and walls, after deducting 24 square meters of doors and windows, how many square meters is the area to be painted?
一间教室长9米，宽6米，高4米的教室，粉刷它的屋顶和墙壁，扣除门窗24平方米，要粉刷的面积是多少平方米？
<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<gadget id="calculator">9 * 4 * 2</gadget>
<output>72</output>

<gadget id="calculator">6 * 4 * 2</gadget>
<output>48</output>

<gadget id="calculator">48 - 24</gadget>
<output>24</output>

<gadget id="calculator">54 + 72 + 24</gadget>
<output>150</output>

<result>150</result>