It takes 3 minutes to cut a piece of wood into 12 pieces, how many minutes will it take to cut the piece of wood.
把一根木头截成12段，每截一次要3分钟，截完这根木头要多少分钟．
<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">3 * 11</gadget>
<output>33</output>

<result>33</result>