Read a book, read the whole book (1/5) on the first day, and read 48 pages on the second day. The ratio of the read to the rest is 3:7. How many pages are there in this book?
读一本书，第一天读全书的(1/5)，第二天读48页，已读的与剩下的比是3：7，这本书共有多少页？
<gadget id="calculator">3 + 7</gadget>
<output>10</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/10) - (1/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">48 / (1/10)</gadget>
<output>480</output>

<result>480</result>