Xiao Ming reads a story book. After reading it for a few days, the number of pages he has read is exactly the number of pages he has not read (3/5). If Xiao Ming reads another 60 pages, the ratio of the number of pages he has read to the number of remaining pages is It is 5:3, how many pages are there in this storybook?
小明看一本故事书，看了几天后，已看的页数正好是未看的(3/5)，如果小明再看60页，则已看的页数与剩下的页数的比是5：3，这本故事书有多少页？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

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

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

<gadget id="calculator">(5/8) - (3/8)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 / (1/4)</gadget>
<output>240</output>

<result>240</result>