A world famous book, read 70 pages a day, finish reading in 6 days; read 80 pages a day, finish reading in 5 days. In order to better understand this book, Ou Ou planned to read a little less every day, and decided to finish it in x days. At this time, he just finished reading x pages every day. How many pages are there in this book?
一本世界名著，每天读70页，6天读完；每天读80页，5天读完．为了更好的读懂这本书，欧欧打算每天少读一点，决定x天看完，此时每天读x页正好读完．这本名著共多少页．
<gadget id="calculator">19 ** 2</gadget>
<output>361</output>

<result>361</result>