If it takes 12 minutes to saw a steel bar into 4 sections, how many minutes will it take to saw it into 10 sections?
把一根钢条锯成4段要用12分钟，如果锯成10段需要多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

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

<gadget id="calculator">4 * 9</gadget>
<output>36</output>

<result>36</result>