Xiao Ming reads a book, the ratio of the number of pages he has read to the total number of pages is 3:7, and later he reads 33 pages, and the ratio of the number of pages he has read to the total number of pages is 5:8, how many pages are there in this book ?
小明读一本，已读页数与总页数的比是3：7，后来又读了33页，这时已读页数与总页数的比是5：8，这本书共有多少页？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(5/8) - (3/7)</gadget>
<output>11/56 = around 0.196429</output>

<gadget id="calculator">33 / (11/56)</gadget>
<output>168</output>

<result>168</result>