Xiao Hua reads a book, reads 15% of the whole book in the first week, and reads 25% of the whole book in the second week. If you read 48 pages in two weeks, how many pages are there in this book?
小华看一本书，第一周看了全书的15%，第二周看了全书的25%．如果两周共看了48页，这本书一共有多少页？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/20) + (1/4)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">48 / (2/5)</gadget>
<output>120</output>

<result>120</result>