It takes 6 minutes to cut a wooden stick into three pieces, so how many minutes will it take to cut it into four pieces?
把一根木棒截成三段要用6分钟，照这样计算，如果截成四段要用多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>