It takes 15 minutes to saw a piece of wood into five sections, so how many minutes will it take to saw it into 10 sections?
把一根木头锯成五段要15分钟，照这样计算，如果要锯成10段，需要多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">15 / 4</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">(15/4) * 9</gadget>
<output>135/4 = around 33.75</output>

<result>135/4 = around 33.75</result>