Wang Hua reads an extracurricular reading. He read (1/4) of the book on the first day, and 30% of the book on the second day. There are still 225 pages left to be read. How many extracurricular readings are there in total? Page?
王华看一本课外读物，第一天看了这本书的(1/4)，第二天又看了这本书的30%，还有225页没有看完，这本课外读物共多少页？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) + (3/10)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 - (11/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">225 / (9/20)</gadget>
<output>500</output>

<result>500</result>