# Breakspace | Quants and LRDI doubts

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Solving quants and LRDI doubts

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SIMCAT 9

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Approach

@skr16  ·  0 karma

ENTRY                                            PRESENT                                           EXIT

T

V,P                                                    T,V                                                    P

S,Q                                                    T,V

U                                                       S,Q,V                                                T

S                                                    U,Q,V

S

@skr16  ·  0 karma

R can come either 1st or last

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Can someone please provide detailed solution for this?

@skr16  ·  0 karma

Let salt qty in A,B and C are a,b,c resp.

Acc a+2b+3c=120 ...i

And 3a+2b+c=180...ii

ii-i we get a-c=30 or c=a-30

putting c in i we get 2b=210-4a ..iii

Now strength of D=(2b+7c)/900

or D=(2b+7a-210)/900

Put eqn iii in above we get D=3a/900 and A=a/100

So D/A= 1:3

@khan.moin00103IIM Calcutta  ·  660 karma
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% f38

If the answer is not in the options(answer can be determined). Do we mark Cannot be determined?

1000
800
1200
Cannot be determined
Jatin Mittal

P and Q are 2 towns connected by a direct road. Biswas started from Q at 9:00 am and travelled towards P. Ashok started from P at 11:24 am and travelled towards Q. They crossed each other at 12:36 pm. Biswas reached P 66 min before Ashok reached Q. At what time Biswas reached P.

a) 2:12pm

b) 2:06pm

c) 2:00pm

d) 2:24pm

@anirbanjyotikar  ·  1 karma

2:24?

@anirbanjyotikar  ·  1 karma

If the total distance is x then s(ashok)=x/t and s(biswas)=x/(144+t-66) = x/t+78 . Now ,they meet at 12.36 so x= x/t * 72 + x/(t+78) *216 . X gets cancelled calculate t you will get a quadratic equation on solving we get t equal to 179.something

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Approach to solve this question .

Anirbanjyoti kar
@anirbanjyotikar  ·  1 karma

@khan.moin00103 sir , yes the difference between two consecutive term is AP . But , why did we consider the general term an= x*n^2 + y*n +z ?

@khan.moin00103IIM Calcutta  ·  660 karma

@anirbanjyotikar Whenever the difference is in AP, we can write general term in this form.

as now an= a + (n-1)d, where d is in AP, hence a linear equation in n.

so, d= bn+c

Now, we get, an= a+ (n-1)(bn+c) which is clearly a quadratic equation in 'n'

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