During the National Day holiday this year, the number of visitors to the Forbidden City in Beijing hit a record high, especially on October 1st. According to incomplete statistics, the number of adults who visited on October 1st was 80,000, 10,000 less than twice the total number of elderly people and children. So how many elderly people and children visited?
今年国庆长假，到北京故宫参观的人数创历史之最，特别是十月一日这天人数最多．据不完全统计，十月一日这天参观的人中成年人就达8万人，比老年人和儿童总人数的2倍少1万人，那么参观的老人和儿童共有多少人？
<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>