A 60 cm long iron wire can just be welded into a cuboid model with a length of 7 cm, a width of 5 cm, and a height of several centimeters.
用一根60厘米长的铁丝，正好可以焊成长7厘米、宽5厘米、高多少厘米的长方体模型．
<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>