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Magoosh Brain Twister: Teddy Just Went to IKEA – Explanation
Question Teddy has a set of dowels, each with a distinct length in centimeters, represented by a prime number. If Teddy can create twenty-three distinct triangles using as many dowels as is necessary...
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Magoosh Brain Twister: What the #@#@!
Let @x@ be defined as the number of positive perfect squares less than x Let #x# be defined as the number of primes less than @x@ If #x# = 5, what is the value of #(@x@)#? (A) 7 (B) 5 (C) 4 (D) 2 (E)...
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Magoosh Brain Twister: What the #@#@! – Explanation
Time to solve Monday’s math challenge: What the #@#@! Here’s the original question, in case you forgot: Question Let @x@ be defined as the number of positive perfect squares less than x Let #x# be...
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Magoosh Brain Twister: Series Fun
As I promised, the Brain Twister is back in a bi-weekly format. Here is one that looks innocuous enough, but once you toy around with it for a few seconds you’ll see it’s anything but easy. The sum of...
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Magoosh Brain Twister: Series Fun – Explanation
Question Here’s the question from Monday: The sum of m consecutive integers is 8. If the sum of n consecutive integers is m, what is the value of n? (A) 15 (B) 16 (C) 31 (D) 32 (E) Cannot be...
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Magoosh Brain Twister: Nasty Squares and Cubes
Good luck with this challenging numeric entry problem! The square root of integer x is equal to the sum of the cubes of y and z. If the squares of y and z are each less than 10, what is the greatest...
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Magoosh Brain Twister: Nasty Squares and Cubes – Explanation
Question Here’s a look back at Monday’s numeric entry challenge question. The square root of integer x is equal to the sum of the cubes of y and z. If the squares of y and z are each less than 10,...
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Magoosh Brain Twister: A Prime Location
Ready for this week’s brain twisting math challenge question? How many three-digit numbers contain three primes that sum to an even number? 27 28 54 55 64 Be sure to check back on Thursday for the...
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Magoosh GRE Brain Twister: A Prime Location – Explanation
I hope you got a chance to try your hand at this week’s question. Let’s start by refreshing your memory: Question How many three-digit numbers contain three primes that sum to an even number? 27 28 54...
View ArticleLearning from GRE Math Practice
I’m going to ask you a question whose answer seems painfully obvious. What is the purpose of doing practice GRE math questions? Take a minute to really consider that question in its entirety, and...
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Brain Twister: Looking for Mr. Right Triangle
Ready for this week’s challenging Brain Twister? Right triangle DEF has a hypotenuse of less than 7. What is the maximum possible area of DEF, if the area of DEF is an integer? Numeric Entry...
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Magoosh Brain Twister: Looking for Mr. Right Triangle – Explanation
Before we get started, make sure you remember Monday’s Brain Twister! Question Right triangle DEF has a hypotenuse of less than 7. What is the maximum possible area of DEF, if the area of DEF is an...
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Magoosh Brain Twister: Zeroing In on the Answer
This week’s Brain Twister is a numeric entry question. Ready to give it a go? …. How many zeroes does ‘n’ contain at the end of the number (to the right of the last non-zero digit)? Numeric Entry...
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Magoosh Brain Twister: Zeroing In on the Answer – Explanation
Ready to check your work? First, refresh your memory. Question …. How many zeroes does ‘n’ contain at the end of the number (to the right of the last non-zero digit)? Numeric Entry...
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Magoosh Brain Twister: The Smallest Big Change
Welcome back, brave Magooshers! Ready to tackle another brain twisting math challenge? Here we go. Lowering which of the following numbers by one will result in the least decrease of n? 17 19 23 29 31...
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Magoosh Brain Twister: The Smallest Big Change – Explanation
Alright Magooshers, let’s see how you fared on this week’s Brain Twister! Question Lowering which of the following numbers by one will result in the least decrease of n? 17 19 23 29 31 Answer and...
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Magoosh Brain Twister – Probability with a High Chance of Turbulence
There’s nothing like a mathematical Brain Twister to put you in the holiday spirit … right? Let’s get started… Melilla, Tasha, and Chester plan to fly on a jetliner that has seven seats per row. The...
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Magoosh Brain Twister: Probability with a High Chance of Turbulence –...
Merry Christmas, Magooshers! Our gift to you? The answer to this week’s Magoosh Brain Twister! (Just what you wanted, am I right?) Before we give you the answer, take a moment to refresh your memory....
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Magoosh Brain Twister: A Trick Up His Sleeve?
Welcome back, Magooshers! We hope that you enjoyed your holiday, and that you’re looking forward to a great 2015. What better way to start the year than with a brand new Brain Twister? Let’s get...
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Magoosh Brain Twister: A Trick Up His Sleeve – Explanation
Want to refresh your memory before we get started? Here’s Monday’s Brain Twister: Question A conjuror will roll one red, six-sided die in his right hand and two blue, six-sided dice. What is the...
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