Kobayashi reads a story book, the ratio of the number of pages he has read to the number of unread pages is 3:4, and later he reads another 33 pages, at this time the ratio of the number of pages he has read to the number of unread pages becomes 5:3, find Total number of pages in this book?
小林读一本故事书，已读的与未读的页数之比是3：4，后来又读了33页，这时已读的与未读的页数之比变为5：3，求这本书的总页数？
<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">33 / (11/56)</gadget>
<output>168</output>

<result>168</result>