Xiaohong reads a storybook in two days. She reads 51 pages on the first day and 25% of the book on the second day. How many pages does this storybook have?
小红两天看完一本故事书，第一天看了51页，第二天看了全书的25%，这本故事书一共有多少页？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">51 / (3/4)</gadget>
<output>68</output>

<result>68</result>