Problem:
Isabella had a week to read a book for a school assignment. She read an average of  pages per day for the first three days and an average of  pages per day for the next three days. She then finished the book by reading  pages on the last day. How many pages were in the book?
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Answer Choices:
A.  
B.  
C.  
D.  
E.  
Solution:
The number of pages in the book is
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions