It takes 6 minutes to saw a piece of wood into 3 sections. If the time for sawing each section is the same, how many minutes will it take to saw 7 sections?
一根木料锯成3段要6分钟，如果每锯一段所用的时间相同，那么锯成7段需要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">3 * 6</gadget>
<output>18</output>

<result>18</result>