Liu Chang reads a story book, the ratio of the number of pages he has read to the number of unread pages is 3:4, and he has read another 66 pages, and the ratio of the number of pages he has read to the number of unread pages is 5:3, how many pages in this book are there?
刘畅读一本故事书，已读与未读的页数比是3：4，又读了66页，已读与未读的页数比是5：3，这本书共多少页？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</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">66 / (11/56)</gadget>
<output>336</output>

<result>336</result>