For those who read in the reading room of the school, adults have seats, but there are no vacancies. After a period of time, the people who read books left (1/8), and 21 new people came, so there were not enough seats, so there were 12 people who crowded into one seat. How many people were reading in the reading room at this time?
学校阅览室内看书的人，大人有座位，而且没有空位．过了一段时间，看书的人走了(1/8)，又新来21人，因此座位不够，只好有12人两人挤在一个座位，这时在阅览室看书的有多少人？
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">21 - 6</gadget>
<output>15</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">15 / (1/8)</gadget>
<output>120</output>

<result>120</result>