Zhang Dong reads a story book. He reads the whole book (1/5) in the first week, and reads (1/4) the whole book in the second week. There are 44 pages left. How many pages does this storybook have?
张东看一本故事书，第一周看了全书的(1/5)，第二周看了全书的(1/4)，还剩44页没有看．这本故事书共有多少页？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 - (1/5) - (1/4)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">44 / (11/20)</gadget>
<output>80</output>

<result>80</result>