A 10-meter-long log is divided into parts every 1 meter. It takes 3 minutes to saw once. How many minutes will it take to saw it?
一根10米长的圆木，每1米分成一份，锯一次需要3分钟，锯完共需要多少分钟．
<gadget id="calculator">10 / 1</gadget>
<output>10</output>

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

<gadget id="calculator">3 * 9</gadget>
<output>27</output>

<result>27</result>