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GMAT important Verified Instructor Notes for Exam Preparation
- Exam (elaborations) • 18 pages • 2024
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2 Linear Equations, 2 Variables, 1 Solution 
We learned back in 9th Grade that if you have 2 linear equations with 2 variables, there 
will always be one unique solution. For Data Sufficiency questions, we can seek out 
these equations in the stimulus and statements and (without calculating) know if we 
have enough information. 
For example, 
If the mileage on car X is currently exactly 3 times the mileage on car Y, what is the 
mileage on car X? 
(1) When each car had 6,000 miles less than they...