Xiaohong reads a book of fairy tales. She reads (1/5) of the whole book on the first day and (1/4) of the whole book on the second day. She reads a total of 54 pages in two days. How many pages does this book have?
小红看一本童话故事书，第一天看了全书的(1/5)，第二天看了全书的(1/4)，两天共看了54页，这本书有多少页？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) + (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">54 / (9/20)</gadget>
<output>120</output>

<result>120</result>