It takes 6 minutes to saw a piece of wood into 4 sections, how many minutes will it take to saw it into 9 sections?
一根木料锯成4段要6分钟，如果要锯成9段，需要多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">2 * 8</gadget>
<output>16</output>

<result>16</result>