The children line up to watch a movie. From the top of the line, Xiao Hua is the 18th, and from the end of the line, Xiao Hua is the 30th. How many people are there in this team?
小朋友排队看电影，从排头数起，小华是第18个，从排尾数起，小华是第30个．这队共有多少人．
<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<gadget id="calculator">18 + 29</gadget>
<output>47</output>

<result>47</result>