Xiaofang reads a story book, the number of pages she read on the first day is the number of pages she has not read (1/5), and she reads 6 pages on the second day, the number of pages she has read is the number of pages she has not read ( 1/4), how many pages does this book have?
小芳看一本故事书，第一天看过的页数是未看页数的(1/5)，第二天又看了6页，这时已看页数是未看页数的(1/4)，这本书有多少页？
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

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

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) - (1/6)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">6 / (1/30)</gadget>
<output>180</output>

<result>180</result>