Xiaohua plans to read a 140-page storybook in 3 days. I read the whole book (2/5) on the first day, and (3/4) on the second day. How many pages do I need to read to read the whole book on the third day?
小华计划3天看完一本140页的故事书．第一天看了全书的(2/5)，第二天看的是第一天的(3/4)，第三天还要看几页才能看完全书？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">140 * (2/5)</gadget>
<output>56</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">140 * (2/5) * (3/4)</gadget>
<output>42</output>

<gadget id="calculator">140 - 56 - 42</gadget>
<output>42</output>

<result>42</result>