It takes 6 minutes to saw a piece of wood into 3 sections. According to this calculation, how many minutes will it take to saw it into 8 sections?
一根木料锯成3段要用6分钟，照这样计算，锯成8段要用多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">3 * 7</gadget>
<output>21</output>

<result>21</result>