A 60 cm long iron wire can be welded into a rectangular box model, which is 6 cm long, 3 cm wide and how many centimeters high.
用一根60厘米长的铁丝，恰好可以焊成一个长方体框模型，长6厘米，宽3厘米，高多少厘米．
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

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

<result>6</result>