A piece of wood is 10 meters long, if one meter is cut off every minute, how many minutes will it take to saw it.
一根木头长10米，每分钟锯掉一米长，多少分钟可以锯完．
<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">1 * 9</gadget>
<output>9</output>

<result>9</result>