Xiao Ming reads a 200-page extra-curricular book. He reads (1/4) of the whole book on the first day and (1/5) of the whole book on the second day. How many more pages did he read on the first day than on the second day?
小明看一本200页的课外书，第一天看了全书的(1/4)，第二天看了全书的(1/5)，第一天比第二天多看多少页？
<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>1/20 = around 0.05</output>

<gadget id="calculator">200 * (1/20)</gadget>
<output>10</output>

<result>10</result>