The school has to paint the classrooms. It is known that the length of each classroom is 8 meters, the width is 6 meters, and the height is 3 meters. The area after deducting the doors and windows is 10.4 square meters. How many square meters is the area to be painted in each classroom?
学校要粉刷教室．已知每间教室的长是8米，宽6米，高是3米，扣除门窗的面积10.4平方米．每间教室要粉刷的面积是多少平方米？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

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

<gadget id="calculator">6 * 3 * 2</gadget>
<output>36</output>

<gadget id="calculator">36 - 10.4</gadget>
<output>25.6</output>

<gadget id="calculator">48 + 48 + 25.6</gadget>
<output>121.6</output>

<result>121.6</result>