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

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Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9850
Location: Pune, India

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24 Mar 2019, 21:31
Sandeepanisha - The above given two questions are very similar and I have solved them using two different methods - algebra and assuming a number.
You can do both using both methods. I encourage you to try.
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Karishma
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26 Mar 2019, 16:46
Thanks Karishma,I will

Source of question-Random material

Sandeepanisha - The above given two questions are very similar and I have solved them using two different methods - algebra and assuming a number.
You can do both using both methods. I encourage you to try.
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Joined: 25 Apr 2018
Posts: 671
GMAT 1: 680 Q49 V34

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10 May 2019, 23:07

Can you tell me whats wrong with this approach?

https://gmatclub.com/forum/what-is-the- ... l#p2272622
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9850
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11 May 2019, 00:26
gmat1393 wrote:

Can you tell me whats wrong with this approach?

https://gmatclub.com/forum/what-is-the- ... l#p2272622

Done.
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Karishma
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23 May 2019, 07:20
Hi Karishma,
(ratio) Donuts of r pounds are made by sugars of p pounds. Because there are no sugars, substitutions of t pounds per sugar of 1 pound are used to make donuts. How many pounds of substitutions are used to make donut of 1 pound in terms of p, r, and t?
A) tp/r B.) tr/p C) t/pr D.) r/tp E pr/t
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Joined: 02 Nov 2017
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23 May 2019, 07:22
Car A drives from M to N at a constant rate of 50 miles per hour and after 1-hour starting car A, car B drives from N to M at a constant rate of 60 miles per hour. If the distance between M and N is 490 miles, then when they meet, what is the distance that moved by car A, in miles?
A. 200miles B. 220miles C. 240miles D. 250miles E. 260miles
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9850
Location: Pune, India

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24 May 2019, 00:22
indu1954 wrote:
Hi Karishma,
(ratio) Donuts of r pounds are made by sugars of p pounds. Because there are no sugars, substitutions of t pounds per sugar of 1 pound are used to make donuts. How many pounds of substitutions are used to make donut of 1 pound in terms of p, r, and t?
A) tp/r B.) tr/p C) t/pr D.) r/tp E pr/t

Hey indu1954,
Please send me the link of the actual question or put up a screenshot. It is difficult to guess the actual meaning of the question if one rewrites it in their own words. Thanks.

1 pound sugar = t pounds substitute
p pound sugar = tp pounds substitute

Donuts r pounds - need sugar p pounds (= substitute tp pounds)
Donuts 1 pound - need substitute tp/r pounds

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Karishma
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Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9850
Location: Pune, India

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24 May 2019, 00:33
1
indu1954 wrote:
Car A drives from M to N at a constant rate of 50 miles per hour and after 1-hour starting car A, car B drives from N to M at a constant rate of 60 miles per hour. If the distance between M and N is 490 miles, then when they meet, what is the distance that moved by car A, in miles?
A. 200miles B. 220miles C. 240miles D. 250miles E. 260miles

In 1 hr, car A travels 50 miles. Now distance between car A and car B is 490 - 50 = 440 miles

This distance is covered by both together car A at 50 mph and car B at 60 mph

When they meet, time taken = 440/(50 + 60) = 4 hrs
In 4 hrs, car A would have traveled = 50 *4 = 200 miles

In all, car A traveled 200 + 50 = 250 miles
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Karishma
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Veritas Prep GMAT Instructor
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Posts: 9850
Location: Pune, India

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24 May 2019, 00:35
Here are a couple of posts on relative speed (the concept on which above question is based):

https://www.veritasprep.com/blog/2012/0 ... elatively/
https://www.veritasprep.com/blog/2012/0 ... -concepts/
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Karishma
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Location: India
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24 May 2019, 16:57
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
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24 May 2019, 16:59
*(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%
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Joined: 07 Nov 2016
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24 May 2019, 17:41
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
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24 May 2019, 17:57
1
sandeepansiha121 wrote:
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

Hello sandeepansiha121 please check the diagram

Attachment:

IMG_20190525_062333.jpg [ 1.97 MiB | Viewed 374 times ]

Now let's form the equation-> Total students= Students-French + Students-Only English + (Students neither French, nor English)
250 = 96 + (80-x) + 3x
x= 37 (A)
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25 May 2019, 02:44
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
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Karishma
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Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9850
Location: Pune, India

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25 May 2019, 02:45
1
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%

_________________
Karishma
Veritas Prep GMAT Instructor

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 9850
Location: Pune, India

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25 May 2019, 02:49
1
sandeepansiha121 wrote:
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

Hey sandeepansiha121,

Total = n(A) + n(B) - Both + Neither

Assuming, number of people who learn Both = x, number of people who learn Neither = 3x

250 = 80 + 96 - x + 3x
x = 37

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Karishma
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26 May 2019, 03:57
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
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26 May 2019, 14:40
Hi Karishma,
Need help to solve this question
https://gmatclub.com/forum/geometry-295 ... s#p2274963
Veritas Prep GMAT Instructor
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27 May 2019, 07:51
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
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Posts: 9850
Location: Pune, India

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27 May 2019, 08:38
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.
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Karishma
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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math   [#permalink] 27 May 2019, 08:38

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