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Backsolving on GMAT Math

First of all, try these challenging GMAT Problem Solving practice problems without a calculator. (A) 2 (B) 3 (C) 4 (D) 5 (E) 6 2) In the month of August, Pentheus Corporation made $200,000 in profit.  Pentheus made 6% of that profit on the second Wednesday of August.   If the profits that day were approximately […]

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GMAT Quant: Arithmetic with Inequalities

Here are four GMAT Data Sufficiency questions involving inequalities. Full solutions will come at the end of this article.   The arithmetic of equations: a review First of all, let’s review what should be more familiar — the arithmetic of equations.   Suppose A = B and P = Q.  The soundbyte is: you can combine […]

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GMAT Quant: Mathematical Grouping Symbols

Many folks remember Order of Operations by means of the mnemonic PEMDAS.  Just for review, PEMDAS is a quick way to remember the following order of mathematical prioritization: Priority #1: P = Parentheses Priority #2: E = Exponents Priority #3: MD = Multiplication & Division Priority #4: AS = Addition and Subtraction A few things […]

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Mathematical Thinking on the GMAT

What does the GMAT Quantitative section test?  Math, of course.  As tautological as that may seem, there is a very subtle point here.  What exactly is math?   Mathematics Strange as it may seem, there is no generally accepted formal definition of the word mathematics.  Most of the dictionary definitions, for example, cover the more […]

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GMAT Number Properties

The single most-tested topic on the GMAT Quantitative Section is something called “Number Properties.”  In a way, this statement, while absolutely true, is a bit deceptive.  It’s like saying the biggest category at a particular zoo is mammals: even if that is completely true, that statement alone doesn’t give us a particular clear idea of […]

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GMAT Math: The Many Meanings of Minus

First of all, for warm-up, a practice Data Sufficiency question. The symbol What does this symbol mean in math? Technically, this symbol, typographically a dash, has three different meanings in mathematics, viz.: a) a subtraction sign b) a negative sign c) an opposite sign   The subtraction sign When the dash appears between two terms  […]

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