Xiaolan reads a science and technology book. She reads 45 pages on the first day and a quarter of the whole book on the second day. The number of pages read on the second day was exactly one-fifth more than that on the first day. How many pages are there in this book?
小兰看一本科技书，第一天看了45页，第二天看了全书的四分之一．第二天看的页数恰好比第一天多五分之一．这本书一共多少页？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(1/4) / (6/5)</gadget>
<output>5/24 = around 0.208333</output>

<gadget id="calculator">45 / (5/24)</gadget>
<output>216</output>

<result>216</result>