Whats the best way to guess on GMAT math problems?
You can eliminate answer choices even when you can’t get a handle on the problem. For any math problems beyond the first five, you can eliminate obvious answer choices with relative safety. For example, if a question states “If a car drives 50 miles per hour from city A to city B and then 70 miles per hour from City B to city A and the cities are 350 miles apart, what was the average speed for the entire trip” then you should eliminate a choice that says 60 mph. GMAT questions are almost never one-step problems that ask you to simply find the average of two numbers. Ask yourself, “Would any GMAT math question be this easy?” If the answer is no, then you can eliminate the choice.
