Teacher:You are given a math word problem and you are supposed to apply an addition mathematical operator on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
Teacher: Now, understand the problem? Solve this instance: Context: A book has 3 chapters. The first chapter is 66 pages long the second chapter is 35 pages long and the third chapter is 24 pages long.

Question: How many pages does the book have altogether?
Student:
125