official quant thread for cat08

[knight.comp]

Originally Posted by vineet.nitd

Now solve this DS question:

Find the value of x/y.

Statement 1: X is the smallest even natural number and y is the highest two digit prime number.

Statement 2: 2y=97x

option 2 alone, as in option 1 X is in upper case Hope that is the catch

[vineet.nitd]

Originally Posted by rahulshaitan

for this both the options are independently sufficient.
please confirm the answer

And this is precisely why i gave this question. Think think ....

Originally Posted by knight.comp

option 2 alone, as in option 1 X is in upper case Hope that is the catch

Had it been Verbal DS, i would have given ur logic a tought.. Please try again.

[bishweshwar1234]

Originally Posted by bindaas_life

Puys .... 3 probs :

1) Let f be a factor of 120,then the number of positive integral solutions of xyz=f is
a) 160 b) 240 c) 320 d) 480

2) Find the 50th term of the series 1,0,3,10,21,36,55
a) 4568 b) 4851 c) 3467 d) 4135

3) Reena walks down an up-escalator and counts 150 steps. Sridevi walks up the same escalator and counts 75 steps. Reena takes three times as many steps in the given time as Sridevi. How amny steps are visible on the escalator?
a) 105 b) 150 c)135 d)120

Hey bindaas_life.

Can you please explain the solution for Q1 & 2. I did not get the solution posted by selebratinglife .
[Originally Posted by selebratinglife
Subtract the first term from the second and second from third and so on till they all become equal..

In this case 1,0,3,10,21,36,55
Now After the first round we get the series as -1,3,7,11,15,19
After second round we get 4,4,4,4,4..
Since we got this after 2 rounds, its a second degree equation. If after three rounds, its a third degree and so on.
Now consider the equation as ax^2+bx+c..Substitute x=1,2,3 and solve to get a,b and c.
]

[bishweshwar1234]

sorry for the above post.

Please explain the solution only for

3) Reena walks down an up-escalator and counts 150 steps. Sridevi walks up the same escalator and counts 75 steps. Reena takes three times as many steps in the given time as Sridevi. How amny steps are visible on the escalator?
a) 105 b) 150 c)135 d)120

Still not getting any clue how to start.

[rahulshaitan]

Originally Posted by bindaas_life

Puys .... 3 probs :

2) Find the 50th term of the series 1,0,3,10,21,36,55
a) 4568 b) 4851 c) 3467 d) 4135

this question can be solved by mere observation and using the options

the series is 1,0,3,10,21,36,55,...

in this series each odd term is odd and each even term is even. therefore 50 th term will be even. but in this case the options are niot correct and thus, none option is correct and the correct answer is 4656

[rahulshaitan]

Originally Posted by vineet.nitd

Now solve this DS question:

Find the value of x/y.

Statement 1: X is the smallest even natural number and y is the highest two digit prime number.

Statement 2: 2y=97x

i think the correct answer would be using both the statements together because in this question we are asked to find the value of x/y and not x/y?

correct me if i m wrong

regards

[MaskedMenace]

Originally Posted by rahulshaitan

hi masked menace please check your 2nd question

hello puys...
For tht 2nd question its 10 days not 100...sorry for the mistake...

and here are the answers:
1. 10 days
2.68
3.15
4.24/5
5.345

[MaskedMenace]

Originally Posted by rahulshaitan

this question can be solved by mere observation and using the options

the series is 1,0,3,10,21,36,55,...

in this series each odd term is odd and each even term is even. therefore 50 th term will be even and there is only one even option
therefore the answer is option a).4568

1 = (-1)*(-1)
0 = (0) *(1)
3 = (1)*(3)
10 = (2)*(5)
21 = (3)*(7)
36=(4)*(9)
55=(5)*(11)
.
.
.

Tn = (n-2)*(2n-3) ->48*97 = 4656 ...But no option..

[knight.comp]

Originally Posted by vineet.nitd

And this is precisely why i gave this question. Think think ....



Had it been Verbal DS, i would have given ur logic a tought.. Please try again.

@vineet, i guess it should then be option 1 alone . Find the value of x or y Hope i got it right this time

[gautam12]

1.The cost of a diamond varies direcdtly as the square of its weight. A diamond fell and broke into four pieces in the ratio 1:2:3:4. As a result the mechant had a loss of 700000. Find the original price of the diamond. (AnsRs. 10lac)

2. At a book store "MODERN BOOK STORE" IS FLASHED USING NEON LIGHTS.tHE WORDS ARE INDIVIDUALLY FLASHED AT INTERVALS OF 5/2,17/4,41/8 SECONDSRESPECTIVELY, And each word is put off after a second. The least time after which the full name of the bookstore can be read again is- (Ans-73.5 seconds)

3. A train approaches a tunnel AB. Inside the tunnel a cat located at a point that is 2/5th the distance of the tunnel AB measured from the entrance A. When the train whistles the cat runs.If the cat moves to the entrance of the tunnel A , the train catches the cat exactly at the entrance. If the cat moves to the exit B, the train catches the cat exactly at the exit. The speed of the train is greater than the speed of the cat by what order ? (Ans - 5:1)

4.Two typists undertake to do a job. The second typist begins working one hour after the first. Three hours after the first typist has begun working, there is still 9/20 of the work to be done.When the assignment is completed, it turns out that each typist has done half the work.how many hours would it take each typist to do the whole job individually ?
(Ans - 10 hour and 8 hour)