A piece of wood is sawed into 10 sections, and each sawing takes 2 minutes. How many minutes will it take in total?
一根木头锯成10段，每锯一次要2分钟，一共需要多少分钟．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>