If it takes 8 minutes to saw a piece of wood into 3 sections, how many minutes will it take to saw it into 7 sections?
一根木料锯成3段要8分钟，那么锯成7段要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<result>24</result>