Xiaojun reads a book, reads 30 pages on the first day, reads 25% on the second day, and leaves 60 pages unread. How many pages does this book have?
小军看一本书，第一天看了30页，第2天看了25%，还剩下60页没看．这本书一共有多少页？
<gadget id="calculator">60 + 30</gadget>
<output>90</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">90 / (3/4)</gadget>
<output>120</output>

<result>120</result>