When Lili reads a story book, the ratio of the number of pages she has read to the number of remaining pages is 2:3. If she reads 63 more pages, the number of pages she has read is exactly 75% of the whole book. How many pages are there in this storybook?
丽丽看一本故事书，已看的页数与剩下的页数比是2：3，如果再看63页，已看页数正好是全书的75%．这本故事书一共多少页？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">63 / (7/20)</gadget>
<output>180</output>

<result>180</result>