If it takes 4 minutes to saw a piece of wood into 3 sections, how many minutes will it take to saw it into 8 sections?
把一根木料锯成3段要用4分钟，锯成8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">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<result>14</result>