A cuboid room is 6 meters long, 4 meters wide, and 25 decimeters high. Now it is necessary to paste wallpapers on the four walls (the doors and windows occupy 8 square meters). How many square meters of wallpaper is needed for this room?
一间长方体的房间，长6米、宽4米、高25分米．现在要在四面墙壁贴壁纸(其中门窗占8平方米)．这个房间需要多少平方米的壁纸？
<gadget id="calculator">25 / 10</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">6 * (5/2)</gadget>
<output>15</output>

<gadget id="calculator">4 * (5/2)</gadget>
<output>10</output>

<gadget id="calculator">15 + 10</gadget>
<output>25</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">50 - 8</gadget>
<output>42</output>

<result>42</result>