It takes 12 minutes to saw 4 sections of a piece of wood. At this speed, how many minutes does it take to saw 6 sections?
一根木头锯4段要12分钟．照这样的速度，锯6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">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<result>20</result>