Algebra-1

Question Analysis
This question assesses the student’s ability to apply the associative property in a real-world context. The problem requires using given partial sums to find the total number of books read by two students (Sarah and Emily) by regrouping terms algebraically.

Key Concept Explanation
The associative property of addition states that the grouping of numbers does not change their sum:
In this problem:
The known sums are and .
The total allows regrouping to isolate .

Step-by-Step Solution
1. Identify Given Information:



2. Apply the Associative Property:
Add the partial sums: