Make an uncovered cube tank with a side length of 5 decimeters out of iron sheet. How much iron is needed at least?
用铁皮做一个棱长是5分米的没盖的正方体水槽．至少需要多少铁皮？
<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<result>125</result>