To make a cube iron box with the sum of the sides being 60 cm, what is the minimum area of the iron sheet?
做一个棱长总和是60厘米的正方体铁盒，至少需要多少面积的铁皮？
<gadget id="calculator">60 / 12</gadget>
<output>5</output>

<gadget id="calculator">5 * 5 * 6</gadget>
<output>150</output>

<result>150</result>