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GMAT Mixtures

by ejkiv


July 19, 2015


GMAT mixtures come in a variety of different forms, but generally mixture problems are just weighted average problems. There are a few differences that we will go over, but think of them in the same manner. This is an example: Solution A consists of 20% iodine and solution B is 5% iodine. If 15 ounces of solution B is mixed with solution A to make a combined solution of 10%, how many ounces of solution A are used? For this we can just set up a weighted average problem:     We will use the ...

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GMAT Statistics

by ejkiv


July 19, 2015


GMAT Statistics. It is probably one of the most hated classes in the entire business school experience. Luckily, you don’t have to worry about a lot of the complexities for quite some time, however this is a section that is getting more play in exams lately, in fact you are likely to see 2 or 3 questions on this topic come exam day. Average is the one concept that is covered, and we have already covered 2 sections related to this subject. Here are a few more: Range: The difference between th...

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GMAT Overlapping Sets

by ejkiv


July 19, 2015


Since the theme of this content is to do things as simple as possible, as quickly as possible, and make as few mistakes as possible, I am going to leave out many of the ways that other books may describe this section. Quite frankly, the equations are easy to mess up and venn diagrams (except in one case) do not represent the information in an easy to read manner. But first, what are GMAT overlapping sets? It is a way to describe two pieces of independent information relating to a singular gr...

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GMAT Weighted Averages

by ejkiv


July 19, 2015


A weighted average is really just a type of average, but there is a bit different way that you can think about these types of problems that will be very helpful in many others. In fact, the methods used in this chapter will help you with with Rates, Work, and Mixture problems that we will discuss in the word problems section. Spend the time to understand it now, and you will be ahead of the game. The ability to handle gmat weighted averages quickly can free up 2-4 minutes on the exam for othe...

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GMAT Averages

by ejkiv


July 19, 2015


Average is synonymous with mean/arithmetic mean and it is defined by a simple equation: This equation will be the backbone to everything that we work on with GMAT averages, but there will be ways to simplify this as we move along. A basic example would be: What is Dan’s average test score if he scored an 80, 85 and 96 on his three exams? Now, 261 divided by 3 is not the end of world, but you can imagine how these numbers might get a little harder to handle if they started to get much l...

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