Xiaoxiao reads a book, she reads (1/4) of the whole book on the first day, 20% of the whole book on the second day, and starts from page 91 on the third day, please count the total number of this book Page?
笑笑读一本书，第一天读了全书的(1/4)，第二天读了全书的20%，第三天她从第91页读起，请你算算这本书共多少页？
<gadget id="calculator">91 - 1</gadget>
<output>90</output>

<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">90 / (9/20)</gadget>
<output>200</output>

<result>200</result>