A cuboid metal water tank without a cover has a length of 6dm, a width of 5dm, and a height of 4dm. At least how many square decimeters of iron sheets are needed to make this water tank.
一个无盖的长方体铁皮水箱，长6dm，宽5dm，高4dm．做这个水箱至少要用多少平方分米的铁皮．
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">4 * 6 * 2</gadget>
<output>48</output>

<gadget id="calculator">5 * 4 * 2</gadget>
<output>40</output>

<gadget id="calculator">30 + 48 + 40</gadget>
<output>118</output>

<result>118</result>