Xiaoli reads a book and reads (3/5) of the whole book a few days later. If the remaining pages are 60 pages less than the number of pages she has read, how many pages does this book have?
小丽看一本书，几天后看了全书的(3/5)，如果剩下的比看过的页数少60页，那么这本书共有几页？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">60 / (1/5)</gadget>
<output>300</output>

<result>300</result>