It took Xiaohua three days to read a book, the first day (1/4) of the whole book, and the second day (2/5) of the whole book. If he actually read 35 pages on the third day, how many pages did he read on the second day?
小华用三天看完一本书，第一天看了全书的(1/4)，第二天看了全书的(2/5)．如果他第三天实际看了35页，那么第二天看了多少页？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">35 / (7/20)</gadget>
<output>100</output>

<gadget id="calculator">100 * (2/5)</gadget>
<output>40</output>

<result>40</result>