A candle is originally 15 cm long, after burning 70 mm, how long is it left?
一根蜡烛原长15厘米，燃烧了70毫米后，还剩多长？
<gadget id="calculator">70 / 10</gadget>
<output>7</output>

<gadget id="calculator">15 - 7</gadget>
<output>8</output>

<result>8</result>