When you encounter a Quantitative Comparison question, be sure to consider which strategy might best apply:
- Video Course
- Video Course Overview
- 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
- Study Guide
- Philosophy
- Office Hours
- Extras
- Prices
Comment on QC Strategy - Miscellaneous
In the Geometry example.
I am sorry. Answer B is
The '175 flashcards' link ain
That's odd. I just checked,
That's odd. I just checked, and it worked for me on two different computers. Is it possible your computer's settings are preventing the link from working?
Yeah, I think it was a
Good to hear!
Good to hear!
Cheers,
Brent
Please can you show the
You're referring to the
You're referring to the question that appears at 1:10 in the video.
QUANTITY A: √(121 x 6400 x 90000)
QUANTITY B: √(8100 x 25600 x 12100)
We can apply a useful root property that says:
√(abc) = (√a)(√b)(√c)
For example: √(9 x 16) = (√9)(√16) = (3)(4) = 12
We get:
QUANTITY A: (√121)(√6400)(√90000)
QUANTITY B: (√8100)(√25600)(√12100)
Evaluate each part to get:
QUANTITY A: (11)(80)(300)
QUANTITY B: (90)(160)(110)
From here we can either calculate both quantities, or we can use the MATCHING OPERATIONS strategy. Let's use matching operations.
Divide both quantities by 11 to get:
QUANTITY A: (80)(300)
QUANTITY B: (90)(160)(10)
Divide both quantities by 80 to get:
QUANTITY A: (300)
QUANTITY B: (90)(2)(10)
At this point, we can see that Quantity B is greater.
Answer: B
Great! Please is there a
These two videos cover that:
These two videos cover that:
- https://www.greenlighttestprep.com/module/gre-powers-and-roots/video/1040
- https://www.greenlighttestprep.com/module/gre-powers-and-roots/video/1041
Cheers,
Brent
Hi Brent!
Thanks for the awesome video.
Please, can you give an example of the 4th strategy you mentioned in the video "Pay close attention to shared information"?
The shared information is
The shared information is extra information that apply to both quantities.
So, if the two quantities were...
QUANTITY A: x
QUANTITY B: -3y²
...an example of shared information might be something like: x > 0
Without that shared information, the correct answer would be D.
However, if we consider the shared info (which is sometimes easy to forget), then the correct answer is actually A.
Cheers,
Brent