Infinite Solutions

Brain Teasers

­Select for a and for b values such that the equation x/a=x-b has more than one solution for x. Make only two selections, one in each column. Answer:A=1 and B=0. This is a GMAT question from the Data Insights section and is technically not a brain teaser, but it is...

Measuring Marbles

Brain Teasers

This month we have another classic-style brain teaser. This one requires some creative problem solving. The answer is a surprisingly small number, so give yourself a chance to work it out and don’t jump right to the answer! You have 9 marbles. 8 have the same weight...

Filling the Tank

Brain Teasers

Ashley and Cassandra drove their cars along the same route for 400 miles and then stopped at a gasoline station, where each purchased exactly the amount of gasoline needed to fill her car’s gasoline tank to capacity. If both cars began with full gasoline tanks,...

Between Two Trains

Brain Teasers

This month we have another classic-style brain teaser.  This one requires some math, but as usual, it also requires some clever problem-solving and reasoning!  Enjoy! Two trains leave two towns that are 100 miles apart. They travel toward each other at rates of 30 mph...

Who Wins the Race?

Brain Teasers

As is often the case, this month’s brain teaser has a lot in common with typical, hard GMAT and GRE questions in ways that are explained in the solution to the question. This is another good one! Enjoy! Gary and Barry race in a 50 yard dash. Gary wins by 5 yards. They...