A 1-meter-long packaging ribbon, 85 cm is used to wrap the gift box, how long is the ribbon left now?
一根1米长的包装丝带，包装礼盒用去85厘米，这根丝带现在还剩多长？
<gadget id="calculator">1 * 100</gadget>
<output>100</output>

<gadget id="calculator">100 - 85</gadget>
<output>15</output>

<result>15</result>