The distance between two electric poles is 120 meters. After adding 19 electric poles at equal distances, how many meters is the distance between the first and the twelfth electric poles?
两根电线杆之间相隔120米，在其间以等距离增加19根电线杆后，那么从第1根到第12根电线杆间相隔多少米．
<gadget id="calculator">19 + 2</gadget>
<output>21</output>

<gadget id="calculator">21 - 1</gadget>
<output>20</output>

<gadget id="calculator">120 / 20</gadget>
<output>6</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">6 * 11</gadget>
<output>66</output>

<result>66</result>