Xiao Ming reads a book. He reads (1/3) in the first week and 30% of the book in the second week. He reads a total of 285 pages in two weeks. How many pages does this book have?
小明看一本书，第一周看了(1/3)，第二周看了全书的30%，两周共看285页，这本书一共多少页？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/3) + (3/10)</gadget>
<output>19/30 = around 0.633333</output>

<gadget id="calculator">285 / (19/30)</gadget>
<output>450</output>

<result>450</result>