Concepts...total fundas!!

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Hi all...this thread is dedicated to post key concepts to tacle specific type of problems...we all have our forte...n our grey areas...lets post well known ways as well as self-discovered ways to tacle problems we're comfortable with...this way, w...
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hello people.

there is a new thread with the same theme going on.
http://www.pagalguy.com/discussions/cat-2010concepts-fundas-and-tips-to-crack-quants-section-25055747/2191164

please continue here.

www.raghavabbhi.com | My take on CAT: http://www.pagalguy.com/discussions/all-i-wanted-to-speak-about-cat-25002933/6315307
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Problem #4

Rahul walks down an up-escalator and counts 150 steps. Aarav walks up the same escalator and counts 75 steps. Rahul takes three times as many steps in a given time as Aarav. How many steps are visible on the escalator?

(a) 180 (b) 150 (c) 210 (d) 120


guyz someone could plz confirm the right answer........getting 120
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pls pls pls give us the answers if not the solutions
my answer to the first one is 52.
am i rite ???

and to the 2nd one
100 ???

3rd one 100 ??



I got 46, 100, 80

please let me know your solution so that i can compare..
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@arnabsuav
70 has got 7,2,5 as factors.
hence the limiting factor here is no. of 7s,which is 28+4=32
hence the ans--32

ye..ans is 32..
Devil has many names..
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arnabsuave Says
200! is divisible by (x!)^n...whats the max. possible value of n when x = 70....plz give ans with explanation...i'm gettin 2,bt dat's not d ans..(i saw dis question in d 1st page of dis thread only)

@arnabsuav
70 has got 7,2,5 as factors.
hence the limiting factor here is no. of 7s,which is 28+4=32
hence the ans--32
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pls pls pls give us the answers if not the solutions
my answer to the first one is 52.
am i rite ???


Bro this thread is not so active...
Official quant thread for CAT 2010 (part2) - Page 187 - PaGaLGuY.com - The Everything of MBA in India and Abroad, CAT 2009, GMAT, XAT, MAT

Post ur queries here...
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Solve these............


Okay.. These are one of the more trickier problems in Quants...
Problem #1
A person walking takes 26 steps to come down on a escalator and it takes 30 seconds for him for walking. The same person while running takes 18 second and 34 steps. How many steps are there ??

Problem #2
An escalator is descending at constant speed. A walks down and
takes 50 steps to reach the bottom. B runs down and takes 90 steps
in the same time as A takes 10 steps. How many steps are visible
when the escalator is not operating?

Problem #3
There is a escalator and 2 persons move down it. A takes 50 steps and B takes 75 steps while the escalator is moving down. Given that the time taken by A to take 1 step is equal to time taken by B to take 3 steps, find the no. of steps in the escalator while it is staionary.

Happy solving!


pls pls pls give us the answers if not the solutions
my answer to the first one is 52.
am i rite ???

and to the 2nd one
100 ???

3rd one 100 ??
More
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Problem #4

Rahul walks down an up-escalator and counts 150 steps. Aarav walks up the same escalator and counts 75 steps. Rahul takes three times as many steps in a given time as Aarav. How many steps are visible on the escalator?

(a) 180 (b) 150 (c) 210 (d) 120

answer is 120
let me know if m rite ??????
pls post the answer if not the solution
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200! is divisible by (x!)^n...whats the max. possible value of n when x = 70....plz give ans with explanation...i'm gettin 2,bt dat's not d ans..(i saw dis question in d 1st page of dis thread only)

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So,answer to be an integer should divide number 990 perfectly....so is 198(198*5=990)..


198!!!!!!!..i did nt understnd dis..n u avoided 12 ka part...

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