A 60cm long iron wire can be welded to a cuboid frame with a length of 7cm, a width of 5cm, and a height of cm.
用一根60cm长的铁丝，正好可以焊接成长7cm、宽5cm、高多少cm的长方体框架．
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<result>3</result>