Reading a book, the number of pages read on the first day is equivalent to (3/5) of the remaining pages, and 120 pages are read on the second day, and the remaining pages at this time are equivalent to (3/5) of the number of pages read 5) How many pages does this book have?
看一本书，第一天读的页数相当于剩余页数的(3/5)，第二天又读了120页，结果此时余下的页数相当于读完页数的(3/5)，这本书共有多少页？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 + (3/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">1 / (8/5)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">1 + (5/3)</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">1 / (8/3)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(5/8) - (3/8)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">120 / (1/4)</gadget>
<output>480</output>

<result>480</result>