If the variables X, Y, and Z take on only the values… …10, 20, 30, 40, 50, 60, or 70 with frequencies indicated by the shaded regions above, for which of the frequency distributions is the mean equal to the median? (A) X only(B) Y only(C) Z only(D) X and Y(E) X and Z If … Read More
The infinite sequence a1, a2, …, an, … is such that a1=2 The sum of the repeating sequence comes from simply figuring out how often the sequence repeats–in this case every 4 terms–and then adding this however many times the sequence itself fits into, in this case, 97. So that’s four terms sum to 3, … Read More
If n is a positive integer, which of the following could be equal to ((n+1)^3)−((n^3)+1)? A. 7^3(6^3−1) B. 7^3(6^3+1) C. 2∗26∗27 D. 3∗31∗32 E. 0 You can do this step-by-step by hand, but it will be a hell of a lot easier if you have the cubic expansion for a binomal handy: (a+b)^3 = a^3 … Read More
Solomon’s truck gets 24 mpg GMAT In this case, you need to look at the units as mpg/lbs or mpg/mph, then multiply these values by lbs or mph, respectively. It’s awkward, but slow down the video to see more. Solomon’s truck gets 24 mpg (miles per gallon) when driven at a speed of 40 mph … Read More
Last year Comfort Airlines had twice as many delayed flights GMAT In an explain the apparent contradiction question, you need to consider what we’re measuring. The discrepancy appears between the number of delays and the number of complaints. Could there be an issue somehow with the quality of the delays–that is, have the delays become … Read More
Weaken questions almost always get broken by asking “how is it possible that the Conclusion is false while the facts remain true?” This is no exception. There’s a problem if you dump shit on the curb. Enough said. To reduce waste of raw materials, the government of Sperland is considering requiring household appliances to be … Read More
The thing to notice here is that every even number has a 2 in it. You can pull all these 2s to the front of the number, which turns a sequence of consecutive evens like this into a string of consecutive numbers (evens and odds). From here, you can see where the larger prime factor … Read More
Here’s my recent appearance on the Testing Ain’t Easy podcast with Stefan Maisnier from MyGuru tutoring! Testing Ain’t Easy with MyGuru Tutoring – News & Opinions on the Dynamic World of Modern Academic, Admissions, and Professional Standardized Tests n this podcast, MyGuru Director of Instruction Stefan Maisnier welcomes #gmat expert, Rowan Hand to discuss the … Read More
Introduction Well we were promised that when the Focus Edition came out, they were only subtracting information from the GMAT rather than adding it. And then we find Completing the Square questions on the test. This is a quadratics topic that was never in the GMAT curriculum before FE, so you do the math on … Read More
99,999^2 – 1^2 = GMAT difference of squares quant question Here’s the actual text of the question in a proper layout: First things first, we need to figure out what sort of question this is. At first, it looks like something where we need to get it back into powers of 10, particularly given the … Read More