During the Dragon Boat Festival holiday, my father and mother took Xiaoqiao and Xiaoya to the "Oriental Green Boat". The ticket price was 270 yuan, the adult ticket price was 90 yuan per person, and the child ticket price was 90 yuan per person. ?
端午节小长假，爸爸和妈妈带着小巧和小亚到"东方绿舟"去游玩，门票价共花去270元，成人票票价是每人90元，儿童票票价每人多少元？
<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">270 - 180</gadget>
<output>90</output>

<gadget id="calculator">90 / 2</gadget>
<output>45</output>

<result>45</result>