1. Home
  • Add a Discussion
Add
Ash Kagzi 3 months ago
whats about your maths ??
Arjun Rathaur 1 year ago
AB is a perfect cube. AC is a power of 3 and AC = 3*AB
So, AB has to be a power 3 which is a multiple of 3(because it is a cube).
First case is AB = 27, then AC is 81. But looking at the options this is not the case.
AB = 3^6 = 729, AC = 2187. The perimeter will be 729 + 2187 + 397
Perimeter = 3313 feet
Note that this building can be triangular, but can not form a triangle since the sum of two side is less than the third side.

i am not scoring in my mocks,my scores are gradually decreasing plus i am really badd at maths how to improve quants pleaseee suggesstttt :(

1 Comment
Aakash Jaiswal 1 year ago
Hi Aviral.

Well the good news is that you have discovered it early in your CAT Prep. I think your scores will definitely improve with correct analysis of the Mocks that you take.
Harish 1 year ago
Let the no of correct qns be (x), incorrect qns be (y) and skipped qns be (z)...

According to the qn,

x+y+z= 50-----(1)

x - y/3 - z/6= 32

Or

6x - 2y -z. = 192-------(2).

Eliminate z by adding the eqns 1 and 2

7x -y= 242

x= (242+y)/7...

We can see that y cannot take values less than 3..

The answer is option (3).
Fanish C.K 1 year ago
hi
Anton Menezes 1 year ago
Hi Surya, Speed Maths refers to any techniques that can help you in performing specific types of calculations faster than the conventional method. Our free course on First Principles can help you get started with that.
Aakash 1 year ago
Tomorrow there is a Free webinar from Magnus Prep on 'CAT 2018- Getting started at the right way' at 7pm. You will find the registration link on the forum itself. Do attend the webinar and you will get answers to all your doubts regarding CAT 2018 Preparation.

At which time number of minutes elapsed since midnight is nine times the number of minutes before noon?

  1. A 8.30 am 10%
  2. B 6.56 am 27%
  3. C 9.46 am 31%
  4. D 10.48 am 31%
Skip
2 Thanks 48 Attempts 3 Comments
Shiva 1 year ago
Let x be the number of minutes since midnight and y be the number of minutes before noon.

From midnight to noon we have 12 hour, thus 720 minutes.

x+y=720

x=9y

9y+y=720

10y=720

implies y=72

We have 72 minutes to noon, so it's 10:48
Open in App