A 56cm long iron wire can be welded into a cuboid teaching aid with a length of 7cm, a width of 4cm and a height of cm.
用一根长56cm的铁丝，正好可以焊成一个长7cm、宽4cm、高多少cm的长方体教具．
<gadget id="calculator">56 / 4</gadget>
<output>14</output>

<gadget id="calculator">7 + 4</gadget>
<output>11</output>

<gadget id="calculator">14 - 11</gadget>
<output>3</output>

<result>3</result>