Official Quant thread for CAT 2013

MBA CAT 2024
26888
@scrabbler said:
Sir, can you explain the flaw in this?regardsscrabbler
@bodhi_vriksha
26889
@scrabbler said:
Flaw in? Attach your solution and figure . I am online through my phone . Ill check if possible:)


PS: Thread dead ?? No questions since morning :(

Team BV--Pratik Gauri


26890
@bodhi_vriksha said:

PS: Thread dead ??



a) 216
b) 432
c) 648
d) 400
e) 1944
26891
@maroof10 said:
@Subhashdec2 bhai 30 aur 40 equations mein kahan se aaye...moreover..answer is 107
bhai 30 aur 40 ka profit and loss h na...
26892
@bodhi_vriksha said:
Flaw in? Attach your solution and figure . I am online through my phone . Ill check if possible

Please do....mere Geometry ke concepts hil gaye :(

regards
scrabbler
26893
@albiesriram said:
a) 216b) 432c) 648d) 400e) 1944
432?
Two ones = 3X9X8 = 216 ways
1 one, 2 x's, 1 y = 3X9X8 = 216 ways
Total = 432

26894
@albiesriram said:
a) 216b) 432c) 648d) 400e) 1944

rest 3 digit not containing 1
9c2 *3!/2! =36*3=108

rest 3 containing 1
9c2*3!= 36*6=324

432
26895
@albiesriram said:
a) 216b) 432c) 648d) 400e) 1944

assuming two 1s in the number, no. of possible cases = (9*8)*3
for other number identical , no. of possibility =72*3
OA 432 ?
26896
@scrabbler said:
Please do....mere Geometry ke concepts hil gaye regardsscrabbler
Il check once i reach home at 8 😃 dont worry :)

One ques from my side : In a km race, if A gives a start of 40m to B, A wins by 19s. If A gives B a 30 sec start , B wins by 40 m. Find time taken by B to run 5000m .

Do post your approach . Let's see who solves in the shortest way :)

Team BV--Pratik Gauri
26897
@bodhi_vriksha said:
Il check once i reach home at 8 dont worry One ques from my side : In a km race, if A gives a start of 40m to B, A wins by 19s. If A gives B a 30 sec start , B wins by 40 m. Find time taken by B to run 5000m .Do post your approach . Let's see who solves in the shortest way Team BV--Pratik Gauri
960/B-1000/A=19
1000/B-960/A=30
1960/B-1960/A=49
40/B -40/A=1
40/B+40/A=11
80/B=12
5000/B=12/80 *5000=125*12/2=125*6=1200 sec?

@bodhi_vriksha EDIT
26898
@albiesriram said:
a) 216b) 432c) 648d) 400e) 1944
9c2*3!/2! + 9c2*3!
26899
@Subhashdec2 said:
960/B-1000/A=191000/B-960/A=301960/B-1960/A=4940/B -40/A=140/B+40/A=1280/B=135000/B=13/80 *5000=125*13/2=812.5 sec?
Try again 😃 Wrong answer :(

Team BV--Pratik Gauri
26900
@bodhi_vriksha said:
Il check once i reach home at 8 dont worry One ques from my side : In a km race, if A gives a start of 40m to B, A wins by 19s. If A gives B a 30 sec start , B wins by 40 m. Find time taken by B to run 5000m .Do post your approach . Let's see who solves in the shortest way Team BV--Pratik Gauri
1500 s? trying orally.

regards
scrabbler
26901
@scrabbler said:
1500 s? trying orally.regardsscrabbler
No ..wrong answer but would like to know your approach . What's your approach?

Team BV--Pratik Gauri
26902
@bodhi_vriksha said:
Il check once i reach home at 8 dont worry One ques from my side : In a km race, if A gives a start of 40m to B, A wins by 19s. If A gives B a 30 sec start , B wins by 40 m. Find time taken by B to run 5000m .Do post your approach . Let's see who solves in the shortest way Team BV--Pratik Gauri
Sir, is it close to 750s ? Approx nikala hai..not solving the whole equations..

(x-40)/b - x/a = 19------- (1)
(x-40)/a = x/b - 30-------(2)

We put x=5000m in above equations..

Time taken by B = 5000/b ~ 750 ?
Is the answer in integer ? ..
26903
@bodhi_vriksha said:
: In a km race, if A gives a start of 40m to B, A wins by 19s. If A gives B a 30 sec start , B wins by 40 m. Find time taken by B to run 5000m .
750 secs ...cant post the approach because i am in office
26904
@ScareCrow28 said:
Sir, is it close to 750s ? Approx nikala hai..not solving the whole equations..
Correct 😃 But share your approach . I want to know how much calculations you did before arriving at the answer ...
@scrabbler share your oral approach :)

Team BV--Pratik Gauri
26905
1! + (1!+2!) + (1!+2!+3!)..... + (1!+....+22!) = ?
26906
@bodhi_vriksha said:
Correct But share your approach . I want to know how much calculations you did before arriving at the answer ...@scrabbler share your oral approach Team BV--Pratik Gauri
Sir, exact 750 hai ya close to 750 ?
26907
@bodhi_vriksha is it 750 secs???

approach: A/B=1000/(960-19B)........(1)
A/B=960/(1000-30B)..........(2)
Solving B=20/3 m/s;
Hence to run 5000m 750 s