Xiao Fang reads a story book. On the first day, he read 20 pages, accounting for 1/5 of the whole book. On the second day, he read 25% of the whole book. How many pages did he read on the second day?
小方读一本故事书，第一天读了20页，占全书的(1/5)，第二天读了全书的25%，第二天读了多少页？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

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

<gadget id="calculator">100 * (1/4)</gadget>
<output>25</output>

<result>25</result>