If it takes 12 minutes to saw a log into 4 pieces, how many minutes will it take to saw the log into 5 pieces?
把一根圆木锯成4段要12分钟，如果把这根圆木锯成5段要多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>