50 students went to visit, 1.2 yuan per person by tram, 4 yuan per person by minibus, 6 yuan per person by subway. These students shared the fare of 110 yuan. How many of them took the minibus?
有50位同学前往参观，乘电车前往每人1.2元，乘小巴前往每人4元，乘地下铁路前往每人6元．这些同学共用了车费110元，问其中乘小巴的同学有多少位？
<gadget id="calculator">50 - 35</gadget>
<output>15</output>

<gadget id="calculator">6 * 15</gadget>
<output>90</output>

<gadget id="calculator">1.2 * 35</gadget>
<output>42</output>

<gadget id="calculator">110 - 42</gadget>
<output>68</output>

<gadget id="calculator">90 - 68</gadget>
<output>22</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<result>11</result>