A 60 cm long iron wire can be welded into a 6 cm long wire. A cuboid teaching aid with a width of 4 cm and a height of how many cm.
用一根60厘米长的铁丝，恰好可以焊成一个长6厘米．宽4厘米，高多少厘米的长方体教具．
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<result>5</result>