Obviously read a story book, read the whole book (2/5) on the first day, and read 12 more pages on the second day than on the first day. At this time, the ratio of the number of pages read to the number of remaining pages is 5:1 , how many pages does this book have?
明明读一本故事书，第一天读了全书的(2/5)，第二天比第一天多读12页，这时已读的页数与剩下页数的比是5：1，这本书共有多少页？
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/6) - (2/5) - (2/5)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">12 / (1/30)</gadget>
<output>360</output>

<result>360</result>