Xiao Ming reads a book, he reads (1/4) of the whole book on the first day, and (1/5) of the whole book on the second day. From page 46 on the third day, how many pages are there in this book?
小明看一本书，第一天看了全书的(1/4)，第二天看了全书的(1/5)．第三天从第46页看起，这本书共多少页？
<gadget id="calculator">46 - 1</gadget>
<output>45</output>

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

<gadget id="calculator">1 / 5</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">45 / (9/20)</gadget>
<output>100</output>

<result>100</result>