It takes 4 minutes to cut a piece of wood into 3 sections, how many minutes will it take to cut this piece of wood into 10 sections?
一根木材截3段用了4分钟，如果把这根木料截10段要用多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

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

<result>18</result>