On December 20, 2023, Brent will stop offering office hours.
- Video Course
- Video Course Overview
- General GMAT Strategies - 7 videos (free)
- Data Sufficiency - 16 videos (free)
- Arithmetic - 38 videos
- Powers and Roots - 36 videos
- Algebra and Equation Solving - 73 videos
- Word Problems - 48 videos
- Geometry - 42 videos
- Integer Properties - 38 videos
- Statistics - 20 videos
- Counting - 27 videos
- Probability - 23 videos
- Analytical Writing Assessment - 5 videos (free)
- Reading Comprehension - 10 videos (free)
- Critical Reasoning - 38 videos
- Sentence Correction - 70 videos
- Integrated Reasoning - 17 videos
- Study Guide
- Blog
- Philosophy
- Office Hours
- Extras
- Prices
Comment on Wind Chill - Question I
Hey Brent
I fail to understand that part (b) is true
The question asks atleast 3, but city E not necessarily faces the risk
So there would be either 2 or 3 cities where frostbite will occur
Since we cannot say with certainity that in "atleast' 3 cities frostbite will occur, shouldn't the statement be false?
But city E definitely has a
But city E definitely has a risk of frostbite.
The air temperature is 0 degrees
The wind is 20 mph
These values correspond with a PERCEIVED temperature of -22 degrees, which is in the "frostbite zone."
When answering part (c), I
I checked the columns of 0 and -5 degrees, as only they have a range that might include perceived temperature of -25 degrees
For -5 degrees temp column, I checked that -25 lies somewhere between -22 and -26 and since these perceived temp. have wind speed 10 and 15 mph resp. So -25 would have a wind speed between these two but can't be 20
Similarly for 0 degrees temp column, I checked that -25 lies somewhere between -24 and -26 and since these perc. temp. have wind speed 25 and 30 mph resp. So -25 would have a wind speed between these two but can't be 20.
So, the statement is false.
Can you please help me out as to where am I wrong?
Hi Kamaksi,
Hi Kamaksi,
You are operating on the principle that the actual air temperature must be either 0 or -5 degrees. This is not true. The air temperature can also be 1 degree or 2.3 degrees, etc.
Since we don't have a separate column for every possible temperature, it's easier to focus on the given wind speed of 20 mph.
At 4:20 in the video, we highlight the row corresponding to a wind speed of 20 mph.
If the air temperature is 0 degrees, then the perceived temperature is -22 degrees. If the air temperature is -5 degrees, then the perceived temperature is -29 degrees.
So, if the wind speed is 20 mph and the air temperature is BETWEEN 0 degrees and -5 degrees, and the perceived temperature will be BETWEEN -22 degrees and -29 degrees.
So, at some temperature between 0 degrees and -5 degrees, the perceived temperature will be -25 degrees.
Does that help?
Thanks a lot Brent
Your videos are amazing!
I'm glad you like them!
I'm glad you like them!
so you mean each point here
frost bite is only indicated by color.
That's correct; each numeric
That's correct; each numeric entry in the boxes represents perceived temperature. At the beginning of the video, the text next to the table notes this.