After a 3 decimeter long wire is cut, there is 15 cm left. How many centimeters is the wire cut?
一根3分米长的铁丝剪了一些后，还剩15厘米，铁丝剪了多少厘米？
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

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

<result>15</result>