Xiaogang reads a science and technology book. He reads (4/25) of this book on the first day and (1/5) of this book on the second day. He reads 6 pages more on the second day than on the first day , how many pages does this book have? (answer in two ways)
小刚读一本科技书，第一天读了这本书的(4/25)，第二天读了这本书的(1/5)，第二天比第一天多读了6页，这本书一共有多少页？(用两种方法解答)
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / 25</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">(1/5) - (4/25)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">6 / (1/25)</gadget>
<output>150</output>

<result>150</result>