Xiao Ming read extracurricular books, and read 24 pages in 3 days. According to this calculation, it will take 8 days for him to finish reading this book. How many pages does this extracurricular book have? (Answer with proportional knowledge)
小明看课外书，3天看了24页．照这样计算，他看完这本书需要8天．这本课外书共有多少页？(用比例知识解答)
<gadget id="calculator">24 * 8</gadget>
<output>192</output>

<gadget id="calculator">192 / 3</gadget>
<output>64</output>

<result>64</result>