A story book has 100 pages. Xiao Ming reads (1/4) of the whole book on the first day and (1/5) of the whole book on the second day. How many pages did he read in total in two days?
一本故事书100页，小明第一天看了全书的(1/4)，第二天看了全书的(1/5)，两天一共看了多少页？
<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">100 * (9/20)</gadget>
<output>45</output>

<result>45</result>