It takes 9 minutes to saw a piece of wood into 4 sections. How many minutes will it take to cut into 8 pieces?
一根木料锯成4段，需要9分钟．若锯成8段需要多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">9 / 3</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>