Li Hua read a story book, read the whole book (1/4) on the first day, read 20% of the whole book on the second day, and read a total of 54 pages in two days. How many pages does this storybook have?
李华看一本故事书，第一天看了全书的(1/4)，第二天看了全书的20%，两天一共看了54页．这本故事书共有多少页？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

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

<result>120</result>