The railway station starts queuing up a few minutes before the ticket is cut, and the number of passengers coming every minute is the same. From the start of ticket cutting to the disappearance of the team, if 5 wickets are opened at the same time, it will take 30 points; if 6 wickets are opened at the same time, it will take 20 points; how many wickets should be opened at the same time to make the 6-point team disappear?
火车站在剪票前若干分开始排队，每分来的旅客人数相同．从开始剪票到队伍消失，若同时开5个剪票口，则需30分；若同时开6个剪票口，则需20分；若同时开多少个剪票口，才使6分队伍消失？
<gadget id="calculator">1 * 5 * 30</gadget>
<output>150</output>

<gadget id="calculator">1 * 6 * 20</gadget>
<output>120</output>

<gadget id="calculator">150 - 120</gadget>
<output>30</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<gadget id="calculator">150 - 90</gadget>
<output>60</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">60 + 18</gadget>
<output>78</output>

<gadget id="calculator">78 / 6</gadget>
<output>13</output>

<result>13</result>