It takes 9 minutes to saw 3 sections of a piece of wood. According to this calculation, how many minutes will it take to saw 6 sections. (Answer with proportional knowledge)
一根木料锯3段需要9分钟，照这样计算，如果锯6段，需要多少分钟．(用比例知识解答)
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">45 / 2</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>