Reason Test Prep Articles 

Welcome to Reason Test Prep Articles. Over the course of decades tutoring the SAT, ACT, GMAT, and GRE, we’ve accumulated a lot of insight, and almost nothing pleases us more than sharing that knowledge with people who are hungry for it! 

Colored Pencils

Colored Pencils

Ben has 30 pencils in a box. Each of the pencils is one of 5 different colors, and there are 6 pencils of each color. If Ben selects pencils one at a time from the box without being able to see the pencils, what is the minimum number of pencils that he must...

Tree Rings

Tree Rings

When an old tree was felled, a very thin ring was detected among the oldest rings in the stump. When the width of rings, each corresponding to one year`s growth, was correlated with local rainfall records, it was found, as expected, that thicker rings had...

Speeding in the State

Speeding in the State

Once again we’re trying to illustrate the brain-teaser-esque nature of GMAT, GRE, SAT, and ACT questions. It tends to be easier to do that with Quantitative questions, but we wanted to illustrate the level of reasoning and critical thinking ability needed...

Infinite Solutions

Infinite Solutions

­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,...

Measuring Marbles

Measuring Marbles

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...

Filling the Tank

Filling the Tank

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...

Between Two Trains

Between Two Trains

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...

Who Wins the Race?

Who Wins the Race?

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...

Birthdays in October

Birthdays in October

This month, for the first time, we are using an official question from the new version of the GMAT as our monthly “brain teaser”. As anyone who knows the GMAT will be able to tell, it’s indistinguishable from questions that appeared on the “Classic GMAT,”...

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