Father, mother and Lan Lan go to the movies and buy 2 adult tickets and 1 child ticket for a total of 80 yuan. The unit price of the child ticket is 1/2 of the adult ticket. How much is the unit price of a child ticket?
爸爸、妈妈和兰兰去看电影，买2张成人票和1张儿童票一共用去80元，儿童票的单价是成人票的(1/2)．儿童票的单价是多少元？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 + (1/2)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">80 / (5/2)</gadget>
<output>32</output>

<gadget id="calculator">32 * (1/2)</gadget>
<output>16</output>

<result>16</result>