Answer:
64 students liked the book.
Explanation:
Since twenty five is 1/4 of 100, you can multiply 25 by 4 to get 100. Since 9 twenty-fifths of the students didn't like the book, you can multiply 9 by 4 to get the number of students that did not like the book. 9 x 4 = 36. 36 students didn't like the book. The rest of the 100 students liked the book. To get the number of students that liked the book, subtract the amount that didn't.
100 - 36 = 64.