A rope is 120 meters long, and it is cut into small pieces with an average length of 30 meters. How many times has it been cut in total?
一根绳子长120米，平均剪成30米长的小段，一共剪了多少次．
<gadget id="calculator">120 / 30</gadget>
<output>4</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<result>3</result>