On Sunday, Mom and Dad took me and my brother to the park to play. Park tickets are: 28 yuan per adult, 14 yuan per child. How much does it cost us to buy tickets?
星期天，爸爸妈妈带我和弟弟到公园玩．公园的门票是：成人每位28元，儿童每位14元．请问我们买门票要花多少钱？
<gadget id="calculator">28 * 2</gadget>
<output>56</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<gadget id="calculator">56 + 28</gadget>
<output>84</output>

<result>84</result>