There is a rope with a length of 120 cm. From one end, make a mark every 3 cm, and make a mark every 4 cm, and then cut off the marked place. How many pieces were the rope cut into?
有一根长为120厘米的绳子，从一端开始每隔3厘米作一个记号，每隔4厘米也作一个记号，然后将标有记号的地方剪断．绳子共被剪成多少段．
<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">40 - 1</gadget>
<output>39</output>

<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<gadget id="calculator">30 - 1</gadget>
<output>29</output>

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

<gadget id="calculator">120 / 12</gadget>
<output>10</output>

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

<gadget id="calculator">29 - 9</gadget>
<output>20</output>

<gadget id="calculator">39 + 20</gadget>
<output>59</output>

<gadget id="calculator">59 + 1</gadget>
<output>60</output>

<result>60</result>