### Double Matrix Method

Lesson by Mike McGarry
Magoosh Expert

Summary
The double matrix method is a powerful tool for solving complex set problems in the GMAT, particularly when each member of a population is classified in two distinct ways.
• The method involves creating a matrix to organize and cross-reference data across two variables, such as gender and education level.
• It simplifies the process of deducing missing information by providing a structured framework to visualize and calculate the relationships between different data sets.
• The columns and rows of the matrix represent the categories of each variable, with additional rows and columns for totals, facilitating easy addition and cross-checking.
• This approach is versatile and can handle various types of data, including numerical values, percentages, and ratios, across multiple categories.
• Practical examples demonstrate how the double matrix method can be applied to solve GMAT problems efficiently, highlighting its utility in managing complex information.
Chapters
00:00
Introduction to the Double Matrix Method
01:59
Organizing Information with the Double Matrix
04:29
Applying the Double Matrix to Solve Problems
06:13
Advanced Application of the Double Matrix Method