Fangfang reads a story book, she reads 45 pages on the first day, and 1/4 of the whole book on the second day, the ratio of the number of pages read on the second day to the number of pages read on the first day is 5:9 ． How many pages are there in this book?
芳芳看一本故事书，第一天看了45页，第二天看了全书的(1/4)，第二天看的页数与第一天看的页数的比是5：9．这本书一共多少页？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

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

<gadget id="calculator">(5/9) / (1/4)</gadget>
<output>20/9 = around 2.222222</output>

<gadget id="calculator">45 * (20/9)</gadget>
<output>100</output>

<result>100</result>