As R is facing north and D is opposite to R as given R can sit at the extreme left facing towards North(given direction)
S is sitting to the left of D So , S will be sitting at the extreme right top hand side. So, the direction which S faces is south.
D S



RB
i hope this pictorial representation as well helps you out with the above explanation.
Hi Monali,
R is facing North, so D is facing South.
S is sitting to the left of D. So the direction S is facing is West.
Given that first it rotated by 45 degress in clock wise and then 135 degress anti clock wise direction. So, until here it will be rotated by 90 degrees anticlock wise direction
Then, rotated 270 degress clock wise so, combining above obtained i.e, 90 degress anticlock wise > total tilt of angle will be 180 degress clock wise.
So, the original North west becomes the new south east point.
Lets assume P is going on the X axis to the east and Q is moving north on Y axis.
At time t = 0, P is at the origin (0,0) and Q is at (0, 50).
At time t = T, P is at (50T,0) and Q is at (0,50 + 25T)
Distance between P and Q is $$ \sqrt {(50T)^{2} + (25T50)^{2}}$$
= $$ \sqrt {3125T^{2} + 2500  2500T}$$
For that to be minimum, $$ 3125T^{2} + 2500  2500T $$ is minimum, ie derivative is 0
6250T  2500 = 0 ie T = .4
Substituting T, we get distance = $$ 20 \sqrt (5)$$
1boy + 2 girls = 1/10 th part in one day
2 boys +1 girl =1/8 th part in one day
So,10b+20g work =16boys +8girl work
Equating them 6 boys=12 girls i.e 1boy = 2girls
1b+2girls in 10days > 4girls in 10days
Asked 1b+1girl> 3girls can do it in x days
Solving it they will do it in 7.5 days.
Let the price of goods before discount be P and the number of goods sold be N. So, total revenue = PN
Price after discount = 6P/10 = 3P/5 and number of goods sold = 22N/10 = 11N/5. Total revenue = 3P/5 * 11N/5 = 33/25 PN
Percentage change in revenue = (33/25  1)*100% = 32%
Hi Pravesh,
If you learn to denote the data given in tabular form then you should be able to answer even the most difficult seating arrangement questions. Cracku has a free video for IBPS Seating arrangement questions which you can find here: https://cracku.in/banking/concept/seatingarrangementvideoconcept
Hi Samik,
In general I advise against students leaving a section completely because some times, there are some very easy questions that students miss out. Especially in CAT 2015, with the quant section expected to be easy, there might be some very straight forward questions in Geometry. So, at least read the question before ignoring it. If you are not confident of the question, ignore it and go forward, but don't ignore questions without reading them.
Regards,
Maruti
Hi Ayush,
I wish I can give you a magic trick to improve speed. But in my experience, the only way to improve speed (and accuracy) is my practicing more. Especially in your case, it looks as though you know the concepts and can solve them if given additional time. That is a positive sign, because improving speed is easier than improving accuracy. I would suggest you to start taking our Free CAT Quotients which are daily tests of 5 questions in a topic. We have uploaded over 150 of them. Additionally, subscribe or buy some courses/books (online or offline) and practice more and more. Remember that every minute you put in will help you improve better and that is the only way to improve speed.
Link to CAT Quotients: https://cracku.in/cat/quotient
The Answer will be A.
With the first information, we can say that none of them have positions as A, B, C, D, E ( Representing persons with their initials)
Now with the second information, guessed order was D, A, E, C, B where 2 positions are correct and 2 people with their predecessors were right.
So possible pairs of predecessors will be (CB), (EC), (AE) , (DA) now considering different cases of predecessors to be true and confirming the order with the information as 2 positions were right in second guess and none of the people have their positions mentioned in first guess we will get order of ranking as EDACB. Hence answer will be A.