To make a cuboid iron box, the length, width, and height are 6dm, 4dm, and 5dm respectively, how many square decimeters of iron sheet are needed at least?
做一只长方体的铁皮箱，长、宽、高分别是6dm、4dm、5dm，至少需要铁皮多少平方分米？
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">24 + 30 + 20</gadget>
<output>74</output>

<gadget id="calculator">74 * 2</gadget>
<output>148</output>

<result>148</result>