If it takes 3 minutes to saw a piece of wood into two pieces, how many minutes will it take to saw a piece of wood into 9 pieces?
把一根木头锯成两段要3分钟，把一根木头锯成9段要多少分钟．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

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

<gadget id="calculator">3 * 8</gadget>
<output>24</output>

<result>24</result>