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# Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math

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Intern
Joined: 02 Nov 2017
Posts: 32
Location: India
GPA: 3.87

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24 May 2019, 15:57
A jogger and walker traveled in the same direction along the equal route at their constant speed rates of 10 km per hour and 6 km per hour, respectively. After 10 minutes the jogger passed the walker, the jogger reaches a certain fountain, how many minutes it takes the walker to reach the fountain?
A. 5 min B. 6 min C. 6 and 2/3 min D. 10 min E. 15 min
Intern
Joined: 02 Nov 2017
Posts: 32
Location: India
GPA: 3.87

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24 May 2019, 15:59
*(probability) 4 traffic lights A, B, C, D have red light. If the probabilities that the red lights of A, B, C, and D hold are 0.5, 0.6, 0.7, and 0.8, respectively, what is the probability that a car passes by A and D and stops B and C, approximately?
A. 4% B. 7% C. 10% D. 15% E. 40%
Intern
Joined: 07 Nov 2016
Posts: 2

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24 May 2019, 16:41
Hi,
Need Help to Solve this problem,
/(set) Of 250 students in a certain class, 80 students learn English and 96 students learn French. When the number of students who learn neither English nor French is 3 times the number of students who learn both English and French,
what is the number of students who learn both English and French?

A. 37 B. 36 C. 39 D. 42 E. 45
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 10506
Location: Pune, India

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25 May 2019, 01:44
indu1954 wrote:
A jogger and walker traveled in the same direction along the equal route at their constant speed rates of 10 km per hour and 6 km per hour, respectively. After 10 minutes the jogger passed the walker, the jogger reaches a certain fountain, how many minutes it takes the walker to reach the fountain?
A. 5 min B. 6 min C. 6 and 2/3 min D. 10 min E. 15 min

Ratio of speed of jogger & walker = 10:6
Time taken to travel same distance for jogger & walker = 6:10 = 3:5

This 3 corresponds to 10 so multiplier is 10/3.
So actual value of 5 is 5*10/3 = 50/3 mins
_________________
Karishma
Veritas Prep GMAT Instructor

Intern
Joined: 23 Apr 2016
Posts: 16
Location: India
Concentration: Entrepreneurship, General Management
GPA: 3.88
WE: Marketing (Consulting)

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26 May 2019, 02:57
In the xy-plane is the slope of line k equal to 0?

(1) The x-intercept of k is 0.
(2) The y-intercept of k is 0
Intern
Joined: 23 Apr 2016
Posts: 16
Location: India
Concentration: Entrepreneurship, General Management
GPA: 3.88
WE: Marketing (Consulting)

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26 May 2019, 13:40
Hi Karishma,
Need help to solve this question
https://gmatclub.com/forum/geometry-295 ... s#p2274963
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 10506
Location: Pune, India

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27 May 2019, 06:51
Sandeepanisha wrote:
In the xy-plane is the slope of line k equal to 0?

(1) The x-intercept of k is 0.
(2) The y-intercept of k is 0

What is the source of this question? It is not very high quality. Each statement independently tells us that the line passes through (0, 0). So the line can be any line with non zero slope passing through the origin or it can be the x axis itself. But what would we consider the x intercept of x axis?
Please send a screenshot of the question and official solution.
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Karishma
Veritas Prep GMAT Instructor

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 10506
Location: Pune, India

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27 May 2019, 07:38
Sandeepanisha wrote:
Hi Karishma,
Need help to solve this question
https://gmatclub.com/forum/geometry-295 ... s#p2274963

Hey Sandeepanisha,

I am not sure what I am missing in your questions but something is not right.
The link given above is locked because it is in the wrong forum but I did get to see the question.
(Put problem solving questions in PS forum and Data sufficiency questions in DS forum)

ABC is a 30-60-90 triangle with sides 5 - 5*sqrt(3) - 10
EDC will be another 30-60-90 but here is the thing - it can have varying area. Say E is very very close to B. Then area of triangle EDC is much smaller than area of ABC.
But say length of EC is same as length of AC. Then the two areas will be same. So the difference in the areas will vary.

Do put up the official explanation of this question and let me know the source.
_________________
Karishma
Veritas Prep GMAT Instructor

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 10506
Location: Pune, India

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27 May 2019, 21:44
indu1954 wrote:
*(probability) 4 traffic lights A, B, C, D have red light. If the probabilities that the red lights of A, B, C, and D hold are 0.5, 0.6, 0.7, and 0.8, respectively, what is the probability that a car passes by A and D and stops B and C, approximately?
A. 4% B. 7% C. 10% D. 15% E. 40%

Looking at the screenshot you sent, it looks like the question is exactly as you have written. I would suggest you to ignore this source since it seems to be very sub-standard.

As for this question, if the red light holds, the car stops. If it changes, the car passes through.

Probability that A and D turn while B and C hold = 0.5 * 0.6 * 0.7 * 0.2 = 4.2%
_________________
Karishma
Veritas Prep GMAT Instructor

Intern
Joined: 23 Apr 2016
Posts: 16
Location: India
Concentration: Entrepreneurship, General Management
GPA: 3.88
WE: Marketing (Consulting)

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06 Jun 2019, 13:24
Hi Karishma,
(geometry) Two people run the circle with 10 rounds, one runs in the inside and the other runs in the outside. When the difference between the inside and the outside is 15 feet, what is the difference of between two people's distance after running 10 rounds, approximately?
A. 800 B. 850 C. 900 D. 950 E. 1,000
Intern
Joined: 30 Jan 2019
Posts: 4
Location: India

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09 Jun 2019, 10:01
hi Karishma,
https://gmatclub.com/forum/as-the-pictu ... 31845.html
Intern
Joined: 02 Nov 2017
Posts: 32
Location: India
GPA: 3.87

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11 Jun 2019, 10:14
Need help to Solve the quant Question.

https://gmatclub.com/forum/geometry-297755.html
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 10506
Location: Pune, India

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11 Jun 2019, 23:25
Sandeepanisha wrote:
Hi Karishma,
(geometry) Two people run the circle with 10 rounds, one runs in the inside and the other runs in the outside. When the difference between the inside and the outside is 15 feet, what is the difference of between two people's distance after running 10 rounds, approximately?
A. 800 B. 850 C. 900 D. 950 E. 1,000

I don't understand this question. It seems to say that one person runs 10 rounds outside and another person runs 10 rounds inside. If the difference in the circumference is 15 feet, the one outside will run 10*15 feet extra. If the difference of 15 feet is between radii or diameter, it will be different. The question needs to clarify properly.
_________________
Karishma
Veritas Prep GMAT Instructor

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 10506
Location: Pune, India

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11 Jun 2019, 23:26
ajaysharma121 wrote:
hi Karishma,
https://gmatclub.com/forum/as-the-pictu ... 31845.html

Hey ajaysharma121,

_________________
Karishma
Veritas Prep GMAT Instructor

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 10506
Location: Pune, India

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11 Jun 2019, 23:27
indu1954 wrote:
Need help to Solve the quant Question.

https://gmatclub.com/forum/geometry-297755.html

Done.
_________________
Karishma
Veritas Prep GMAT Instructor

Intern
Joined: 02 Nov 2017
Posts: 32
Location: India
GPA: 3.87

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12 Jun 2019, 17:50
https://gmatclub.com/forum/geometry-297753.html
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 10506
Location: Pune, India

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13 Jun 2019, 02:18
indu1954 wrote:
https://gmatclub.com/forum/geometry-297753.html

Hey indu1954,

The requested post doesn't exist anymore. Could you please check!
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Karishma
Veritas Prep GMAT Instructor

Manager
Joined: 01 Jan 2019
Posts: 107
Concentration: Finance, Entrepreneurship
GPA: 3.24

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13 Jun 2019, 02:26
Hi Karishma,

Weighted average is a gray area section for me, can you please help me in this problem.

https://gmatclub.com/forum/1-unit-of-x- ... 96986.html

Posted from my mobile device
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 10506
Location: Pune, India

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13 Jun 2019, 02:55
Shef08 wrote:
Hi Karishma,

Weighted average is a gray area section for me, can you please help me in this problem.

https://gmatclub.com/forum/1-unit-of-x- ... 96986.html

Posted from my mobile device

Hey Shef08,

Done here: https://gmatclub.com/forum/1-unit-of-x- ... l#p2292835

If you struggle with weighted averages, check out this post: https://www.veritasprep.com/blog/2011/0 ... -averages/
_________________
Karishma
Veritas Prep GMAT Instructor

Manager
Joined: 18 Feb 2018
Posts: 104
Location: India
GMAT 1: 750 Q45 V41
GMAT 2: 750 Q50 V41

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15 Jun 2019, 23:13
Hi VeritasKarishma, Can you please tell me most important quant topics I need to cover. I have a booked GMAT next week. I thought I was good at quant so I concentrated mostly on my verbal ability. Now my mock score is only 45. My target is 50/51. I am ready to put in 100 hours this week.Thanks!
Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math   [#permalink] 15 Jun 2019, 23:13

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