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. The area after deducting the doors and windows is 12.5 square meters. How many square meters is the area to be painted?
学校要粉刷一间教室的四壁和天花板．已知教室的长是10米，宽8米，高是3米，扣除门窗的面积12.5平方米，要粉刷的面积是多少平方米？
<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 - 12.5</gadget>
<output>35.5</output>

<gadget id="calculator">80 + 60 + 35.5</gadget>
<output>175.5</output>

<result>175.5</result>