Xiaofei reads a story book, reads the whole book (3/8) in the first week, and reads 40 pages in the second week. At this time, the ratio of the number of pages read to the number of pages not read is 7:5. How many pages does this storybook have?
小飞看一本故事书，第一周看了全书的(3/8)，第二周看了40页，这时已看页数与未看页数的比是7：5．这本故事书一共有多少页？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(7/12) - (3/8)</gadget>
<output>5/24 = around 0.208333</output>

<gadget id="calculator">40 / (5/24)</gadget>
<output>192</output>

<result>192</result>