A classroom with a length of 12 meters, a width of 5 meters, and a height of 3 meters is plastered, and the area of the doors, windows and blackboards is 9.8 square meters. How many square meters is the plastered area?
长12米，宽5米，高3米的教室，抹上石灰，扣除门窗黑板面积9.8平方米，抹石灰的面积有多少平方米？
<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">3 * 12</gadget>
<output>36</output>

<gadget id="calculator">60 + 15 + 36</gadget>
<output>111</output>

<gadget id="calculator">111 * 2</gadget>
<output>222</output>

<gadget id="calculator">222 - 60 - 9.8</gadget>
<output>152.2</output>

<result>152.2</result>