The school reading room opened last Monday. At the beginning, each person had one seat, and it happened to be full. After the students left (1/8), another 21 people came in. At this time, there were not enough seats, and there were 12 students who shared one seat with two students. How many seats are there in the school reading room?
上星期一学校阅览室开放，开始时每人一个座位，正好座满．学生走了(1/8)后，又进来21人，这时座位不够，有12个学生每两人合坐一个座位．学校阅览室共有多少个座位？
<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>