Use a 120 cm long iron wire to make exactly a cuboid frame with a length of 15 cm, a width of 9 cm, and a height of cm.
用一根120厘米长的铁丝正好制成一个长15厘米、宽9厘米、高多少厘米的长方体框架．
<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<gadget id="calculator">30 - 15 - 9</gadget>
<output>6</output>

<result>6</result>