The library was full of seats. After a class, 12.5% of the people who read books left, and another 30 people came in. At this time, there were not enough seats, so 10 people had to squeeze together and sit on a stool. How many seats does the library have?
图书馆座无虚席，一节课后，看书的人走了12.5%，又进来了30人，这时座位不够了，只好有10人每两人挤在一起坐一个凳子．该图书馆一共有多少个座位？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">30 - 5</gadget>
<output>25</output>

<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">25 / 0.125</gadget>
<output>200</output>

<result>200</result>