It took 9 minutes to saw a piece of wood into 3 sections, how many minutes would it take to saw it into 5 sections?
把一根木料锯成3段用了9分钟，要是锯成5段要用多少分钟．
<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">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">(9/2) * 4</gadget>
<output>18</output>

<result>18</result>