Use an 80 cm long iron wire to form a rectangular parallelepiped frame with a length of 10 cm, a width of 6 cm, and a height of cm.
用一根长80厘米的铁丝，恰好可以围成一个长10厘米，宽6厘米，高多少厘米的长方体框架．
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<result>4</result>