A room is 6 meters long, 4 meters wide, and 2.8 meters high. If you paste wallpaper on the walls and ceiling of the room, and deduct 10 square meters of doors and windows, how many square meters of wallpaper is needed?
一间居室长6米，宽4米，高2.8米，在居室四壁和顶棚贴墙纸，扣除门窗面积10平方米，至少需要墙纸多少平方米？
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">4 * 2.8</gadget>
<output>11.2</output>

<gadget id="calculator">6 * 2.8</gadget>
<output>16.8</output>

<gadget id="calculator">24 + 11.2 + 16.8</gadget>
<output>52</output>

<gadget id="calculator">52 * 2</gadget>
<output>104</output>

<gadget id="calculator">104 - 24 - 10</gadget>
<output>70</output>

<result>70</result>