GMAT Official Guide 2020 – Data Sufficiency Question #424 Solution
Data Sufficiency questions can be challenging to get your mind around on the GMAT under the best of circumstances, and they’re made even harder when they combine a number of different elements and nuances that make determining sufficiency even more difficult. Question #424 from the GMAT Official Guide 2020 is one of those questions that […]
GMAT Primes and the “Magic” of the Number 2
Numbers play an important role on the quantitative section of the GMAT, for obvious reasons, and arguably the most important numbers tested are prime numbers. As a reminder, a prime number is any number whose only two factors are 1 and itself. The first ten prime numbers, which you should know for the GMAT, are […]
GMAT Interest Rate Problems – Part 2: Compound Interest
In “GMAT Interest Rate Problems – Part 1” we looked at simple interest and the way it’s commonly tested on the GMAT. What makes it “simple” is the fact that interest is accrued over one (1) time period, generally one year. If you invest $5,000 and earn an interest rate of 5%, it’s assumed that […]
Solving GMAT Factorials
GMAT problem solving questions that contain the words “How many ways…?” may land you in a situation where you have to deal with factorials. Of course, we have useful strategies for getting certain of these types of questions right without resorting to combinatorics. However, sometimes the fastest and easiest way to answer these questions is […]
The Hardest GMAT Problems of 2014
Ready to Crack 700? Test Yourself Against These Challenging GMAT Questions Some of my students come to me just needing an above-average GMAT score to be accepted to their target business schools. But many of them are shooting for the upper 600’s — or even to crack 700! — to have the best chance of […]
Solving for “x” in GMAT Algebraic Equations
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I want to get back to the basics in this blog post. As you’ve probably noticed in your GMAT prep, a lot of times you have to do basic math in the context of solving more difficult or complex GMAT math problems. We spend a lot of time teaching you how to solve those more […]
GMAT Math – Inequalities with Two Variables
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Inequalities on GMAT problem solving questions are pretty straightforward. In their most basic form, you solve an inequality almost exactly like you solve an equation, remembering to reverse the inequality sign if you end up multiplying or dividing by a negative number. Nothing earth-shattering there. But what about more difficult GMAT inequalities involving two variables? […]
GMAT Math Tip – Trapezoids
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For whatever reason, trapezoids tend to freak students out on the GMAT. Maybe it’s because the formula for finding the area of a trapezoid doesn’t “look” like all the other quadrilateral formulas. Maybe it’s because trapezoids have a bizarre looking shape. Whatever the reason, I’d like to make your life a whole lot easier as […]
GMAT Mixture Problems (Algebraic Solution)
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Mixture problems (dry or chemical) are a common type of word problem tested on the GMAT. They all work essentially the same way and are relatively easy once you know what you’re supposed to do. In my video lesson “Problem Solving — Common GMAT Word Problems,” I teach a non-traditional strategy for solving mixture problems […]
The Power of Common Sense
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In 1776, Thomas Paine wrote Common Sense, which became the moral and intellectual touchstone for the American colonists struggling for independence from England. What does this have to do with the GMAT? Nothing politically, of course. But the concept of using common sense to eliminate clearly wrong answers is a remarkably powerful concept on the […]
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