Xiao Ming has a story book. He read 26 pages on the first day and 20% on the second day. There are 54 pages left. How many pages are there in this book?
小明有一本故事书，第一天看了26页，第二天看了20%，还剩下54页，这本书共有多少页？
<gadget id="calculator">26 + 54</gadget>
<output>80</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 / (4/5)</gadget>
<output>100</output>

<result>100</result>