If it takes 9 minutes to saw a piece of wood into 3 pieces, how many minutes will it take to saw it into 12 pieces?
一根木头锯成3段要9分钟，锯成12段要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">(9/2) * 11</gadget>
<output>99/2 = around 49.5</output>

<result>99/2 = around 49.5</result>