The school has to paint the walls and ceiling of a classroom. It is known that the length of the classroom is 10 meters, the width is 8 meters, and the height is 3 meters. Deducting the area of doors and windows of 15 square meters, the area to be painted is square meters?
学校要粉刷一间教室的四壁和天花．已知教室的长是10米，宽是8米，高是3米．扣除门窗的面积15平方米，要粉刷的面积是平方米？
<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">10 * 3 * 2</gadget>
<output>60</output>

<gadget id="calculator">8 * 3 * 2</gadget>
<output>48</output>

<gadget id="calculator">48 - 15</gadget>
<output>33</output>

<gadget id="calculator">80 + 60 + 33</gadget>
<output>173</output>

<result>173</result>