Xiaohong reads a story book. She reads 20% of the whole book on the first day and 1/3 of the whole book on the second day. She reads a total of 120 pages in two days. How many pages does this book have?
小红看一本故事书，第一天看全书的20%，第二天看全书的(1/3)，两天共看120页，这本书有多少页？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/5) + (1/3)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">120 / (8/15)</gadget>
<output>225</output>

<result>225</result>