Qingqing took the train back to her grandma’s house with her mother. When buying the ticket, her mother paid 100 yuan and got back 40.6 yuan. Qingqing bought a student ticket, which is half the adult fare. Do you know how much Qingqing’s fare is? ?
青青和妈妈一起坐火车回姥姥家，买车票时妈妈付了100元，找回40.6元，青青买的是学生票，学生票是成人票价的一半，你知道青青的票价是多少元吗？
<gadget id="calculator">100 - 40.6</gadget>
<output>59.4</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">59.4 / 3</gadget>
<output>19.8</output>

<result>19.8</result>