Xiaoming's mother and Xiaohong's mother took them to the park. The tickets cost 11 yuan in total, 4 yuan for each adult ticket, and how much is each child ticket?
小明的妈妈和小红的妈妈带他们俩人去公园玩，买门票一共花了11元，成人票每张4元，儿童票每张多少元？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">11 - 8</gadget>
<output>3</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>