If it takes 6 minutes to cut a stick into 4 pieces, how many minutes will it take to cut the stick into 10 pieces at the same speed?
把一根木棒截成4段要用6分钟，那么用同样的速度把这根木棒截成10段要用多少分钟．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">6 / 3</gadget>
<output>2</output>

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

<result>18</result>