A story book has 200 pages. Xiaohong reads 20% of the whole book on the first day and 25% of the whole book on the second day. How many pages does Xiaohong read in two days?
一本故事书200页，小红第一天看全书的20%，第二天看全书的25%，小红两天共看多少页？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/5) + (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">200 * (9/20)</gadget>
<output>90</output>

<result>90</result>