**Weighted Averages II (Advanced) **

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Summary

The content delves into an advanced technique for solving weighted average problems on the GMAT, specifically designed for individuals with strong mathematical and visual thinking skills.

- Introduces an advanced method for solving weighted average problems that can save time for those adept in math.
- Explains the concept using the proportional reasoning approach for cases involving only two groups, emphasizing the relationship between group sizes and their distances on a number line from the overall average.
- Illustrates the advanced technique with examples, including calculating the average mass of vehicles on a ferry and determining the average salary difference between two classes of employees at a corporation.
- Highlights that this advanced method relies on understanding the reciprocal ratio of the proportions of the group sizes to the distances from the group averages to the total average.

Chapters

00:00

Introduction to Advanced Technique

01:31

Proportional Reasoning and Weighted Averages

03:03

Applying the Technique: Vehicle Example

05:29

Applying the Technique: Corporate Salary Example