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- General GRE Info and Strategies - 7 videos (free)
- Quantitative Comparison - 7 videos (free)
- Arithmetic - 42 videos
- Powers and Roots - 43 videos
- Algebra and Equation Solving - 78 videos
- Word Problems - 54 videos
- Geometry - 48 videos
- Integer Properties - 34 videos
- Statistics - 28 videos
- Counting - 27 videos
- Probability - 25 videos
- Data Interpretation - 24 videos
- Analytical Writing - 9 videos (free)
- Sentence Equivalence - 39 videos (free)
- Text Completion - 51 videos
- Reading Comprehension - 16 videos
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Comment on Intro to GRE Quantitative Comparison (QC)
I'm very relieved to have
I'm glad you like it!
I'm glad you like it!
The best set of online
Thanks!
Thanks!
I am so glad, i found this.
(Y)
when i solved many QC problem
Quantitative Comparison
Quantitative Comparison question have only 4 answer choices:
A) The quantity in Column A is greater.
B) The quantity in Column B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
So, E can never be the correct answer of a Quantitative Comparison question.
My blunder sorry! i was
I wouldn't say that it's rare
I wouldn't say that it's rare for the correct answer to be D on an Quantitative Comparison question.
How is it possible that x= -5
Hi Ruby,
Hi Ruby,
You're referring to the question that appears at 3:20 in the video.
The given information tells us that x² = 25
x = 5 is one solution, since 5² = (5)(5) = 25
x = -5 is another solution, since (-5)² = (-5)(-5) = 25
For more on multiplying positive and negative numbers, see the following video: https://www.greenlighttestprep.com/module/gre-arithmetic/video/1059
its really a relevant effort
Thanks Shahbaz!
Thanks Shahbaz!
In the question where the
Hi Suhas,
Hi Suhas,
You're referring to the question that starts at 2:10 in the above video.
The key here is that their heights add to 140 inches AND Kyla is taller than Glen.
For example, Kyla could be 72 inches tall, and Glen could be 68 inches tall.
Or Kyla could be 70.5 inches tall, and Glen could be 69.5 inches tall.
Or many other scenarios.
Now let's say for a moment that Kyla is 67 inches tall. This means Glen is 73 inches tall (to get a sum of 140 inches). HOWEVER, this does not meet the condition that Kyla is taller than Glen. So, it CANNOT be the case that Kyla is 67 inches tall.
Try finding some other values for their heights, and you'll find that Kyle will ALWAYS be more than 68 inches tall. In fact, she will always be taller than 70 inches.
Does that help?
Cheers,
Brent
Hi Brent,
I am further along the course but somehow ended up on this page again. In a later lesson, you mentioned that GRE only cares about the positive values for square roots. For example, sq rt of 25 = + 5 and - 5, however, since GRE only cares about the positive value (+ 5), won't the answer for the last example in this video be A? Please let me know. Thanks.
You're referring to the
You're referring to the question at 3:20 in the video.
Keep in mind that the original question does not have any square root signs.
The square root NOTATION tells us to take the POSITIVE square root of a number.
So, for example, √9 = 3, √25 = 5 and √49 = 7
Conversely, the equation x² = 25 does not feature any square root notation.
In this case, there are TWO SOLUTIONS: x = 5 and x = -5
If we want to formalize this outcome we can write:
If x² = k, then there are two possible solutions: x = √k and x = -√k
Does that help?
Cheers,
Brent
Yup, that cleared things up.
Hey Brent,
It's so good to learn from you. I am enjoying, videos are consistent. Please attach more practice under each video.
Regards,
Easin
Thanks for the kind words!
Thanks for the kind words!
I add new practice questions to the course everyday.