@rahul.ubercul I feel it's just a data collection technique...thanks anyways...

@mazaasudip Correct answer is Option E

@abhinavchitre Correct answer is option D

d.For a convention,a hotel charges a daily room rate of $120 for 1 person and x dollars for each additional person.what is the charge of each additional person
1.The daily cost per person for 4 people sharing the cost of a room equally is $45
2.The daily cost per person for 2 people sharing the cost of a room equally is $25 more that corresponding cost for 4 people.

@Mission_10 i think ur approach for 2. question ie wieght of John is wrong coz the eqn from 1st stmt shud be T+M = J
so i dont knw how u computed further..
e1 im looking for a correct answer n explaination for same...!!!

for the quest of dist of A and B.. dey hv nt mentioned from which direction is C.. they hv nt given A,B,C are in straight line.... so both are insufficient...,

Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?
(1)Two of the interior angles of ABCD are right angles.
(2)The degree measure of angle ABC is twice the degree measure of angle BCD.

Invban, I appreciate your kind reply.

@amit-sharma28 I think the DS in CATS of past years were very good ........I find DS in GMAT a little easier than CAT standards , I am not sure but if u get the study material of DS when CAT was paper based (around 2004 onwards) u can get a good amt of practice .........also u can find zillions of questions in a plethora of GMAT forums ........

Dear Puys,

Could you please guide me to to the correct study material for Data Sufficiency section of GMAT. I will be grateful to you. I have searched the forum for the same info, but could not find any. On Flipkart there are some books from Veritas publication, but I doubt how helpful would they be.

Current Status: Till now I have completed OG 13 and OG Verbal guide, facing issues in SC though. But I hope Manhattan SC strategy guide will help immensely.

Regards,

Amit

In a DS question if as per Statement 1 X = 3 and as per Statement 2 the value of X comes out to be 4, can we say each statement alone is sufficient or are we supposed to choose both together cannot be used to ans.

@mbaQuest12 Hi,

A is not the answer for sure. I would approach the problem like this. Sum of interior angles of a quardrilateral is 360. if two are 90, then sum of remaining two is 180.

now taking option B, it says angle ABC is twice the measure of angle BCD.

Look into the rough diagram i have attached. They have not mentioned which angle is 90. So from figure 1 angle ABC can be 90 and angle BCD can be 45, in which case none of the angles in the quardrilateral is 60.

From figure two, angle ABC can be 120 and angle BCD can be 60 if angle A and angle B are both 90.

So taking both the conditions also we cannot say for sure, that the quardrilateral has one angle as 60 degrees. Hence option E.

Please let me know if it is not clear.

If y>=0, what is the value of x?
(1) |x-3| >=y
(2) |x-3| <= -y

Ans = B. Please provide/explain the solution.

Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?
(1) Two of the interior angles of ABCD are right angles.
(2) The degree measure of angle ABC is twice the degree measure of angles ABCD.

I worked out the answer as A, but turns out the correct answer is E. Can someone explain how?

@[436816:Pushpayan]: Hi.. well, can you post some more questions where you think solution is not clear as per OG's explanation. All puys would have a look into it and we can come to a common approach for this. Sounds good ?

@[577265:deepdutta2402] : Hi I understand whatever you have mentioned and whatever OG has mentioned. My only point was because, i have seen in a lot of DS questions, they mention "since this is not stated it cannot be assumed". that is the reason i was confused. I have actually got quite a few DS questions incorrect for the very same reason of assuming things. Anyways, if that is what the pagalguy forum thinks, then maybe my reasoning was wrong, though i would say i dont find OG's solution convincing, because of my own experience with other DS questions.

thanks by the way.

@Pushpayan said: Hi All, this is regarding a DS question in the GMAT OG 11th edition. The question goes like this. "A Certain group of car dealerships agreed to donate 'x' dollars to a red cross chapterfor each car sold during a 30 day period. what was the total amount that was expected to be donated. (1) A total of 500 cars were expected to be sold (2) Sixty more cars were sold than expected, so that the total amount actually donated was $28,000." Now i solved the above question stating answer choice 'E' that both statements taken together cannot solve the question. the OG solution has chosen option 'C' stating both statements taken together can solve the question. My reasoning is the keyword "30-day period". In the question it says that the dealership is considering sales for a 30 day period. but in statement 1 that 30-day period keyword is missing. So i cannot assume that the 500 cars were sold in that 30 day period. But that is what OF has done. I want to know how would the people of pagalguy approach to this question, because i want the correct solution for the actual GMAT if such a question comes, and not the solution that OG has given. Expecting a quick response. thanks!!

Hi All, this is regarding a DS question in the GMAT OG 11th edition. The question goes like this.

"A Certain group of car dealerships agreed to donate 'x' dollars to a red cross chapterfor each car sold during a 30 day period. what was the total amount that was expected to be donated.

(1) A total of 500 cars were expected to be sold

(2) Sixty more cars were sold than expected, so that the total amount actually donated was $28,000."

Now i solved the above question stating answer choice 'E' that both statements taken together cannot solve the question. the OG solution has chosen option 'C' stating both statements taken together can solve the question.

My reasoning is the keyword "30-day period". In the question it says that the dealership is considering sales for a 30 day period. but in statement 1 that 30-day period keyword is missing. So i cannot assume that the 500 cars were sold in that 30 day period. But that is what OF has done.

I want to know how would the people of pagalguy approach to this question, because i want the correct solution for the actual GMAT if such a question comes, and not the solution that OG has given. Expecting a quick response. thanks!!

@dudeabhi011 said:87. Is the number of seconds required to travel d1 feet atr1 feet per second greater than the number of secondsrequired to travel d2 feet at r2 feet per second?(1) d1 is 30 greater than d2.(2) r1 is 30 greater than r2. Can any one please clear my doubt regarding why both statements together cant be true ??

Because we dont know whether d2 is less than or greater than r2.Hence, even if we have both the statements , we still can't be sure which one is greater.

Folks - just wanted to give everybody here a heads-up - Once we move to the new forum, I will be closing this thread down. It's anyway gotten way too long.

Once we move to the new section, what I'd like you to do is create a thread for each problem that you want to discuss. The title should follow the format - "Source" "Type" "Question Number" "Misc information"
So thread titles will now look like "OG12 DS #247" or "TIME PS #7 Book5Pg38"

Why I am doing this -
In this thread alone there are a ton of good problems that most likely nobody is ever going to read because it's buried too deep. And that's a serious waste. The new format allows somebody to more efficiently use the tags to find a particular solution rather than reposting the question.

As always - open to suggestions and discussions

kaps07 Says

why can't x be zero apart from even ? any odd number raised to the power zero is 1 which is an interger greater than zero. I think x is given as an interger and not only positive integer. if you work with x = 0 , statement 1 is not sufficient ?

Oops ! I misunderstood the question. I thought it was odd int raised to the power x. It is clear now.

So here is my explanation of A being the right answer.

Given: x is integer. x raised to an Odd number gives us >0. This means x>0.

Stem: Is w-z> 5(7^(x-1)-5^x) ?

1. z<25 and w=7^x

Substituting the value of w in question stem, we get.

Is 7^x - z > 5.7^(x-1) - 5^(x+1) ?

Solving,

Is 2.7^(x-1) + 5^(x+1) > z ?

Now, we are given that x>0, thus min possible value of x =1

Substitute x=1

Is 27> z ?

We are given that z<25 and thus the answer is yes. SUFFICIENT.



2. x=4

Even if we substitute this value in the question stem, we have no clue about w and z. Thus Insufficient.


Hence the answer A.

why can't x be zero apart from even ? any odd number raised to the power zero is 1 which is an interger greater than zero. I think x is given as an interger and not only positive integer. if you work with x = 0 , statement 1 is not sufficient ?

Question 5: Data Sufficiency : Is y = 3?
(1) ** (y - 3)(x - 4) = 0
(2) ** (x - 4) = 0
What is the answer

Answer is E

Question 5: Data Sufficiency : Is y = 3?
(1) ** (y - 3)(x - 4) = 0
(2) ** (x - 4) = 0
What is the answer

For q1 , the answer should be (e )

x,3, 1, 12, 8

Statement 1--->if x>6 , then median of say 7,3,1,12,8 is 7 and average is 6.2 so median > average however for a large value for x say 40 , median =8 and average of 5 nos x > median of the 5 numbers possible when x=9 or more median would be 8 and average median , so cant say conclusively

please provide the solutions ASAP for the attached questions....

Thanks27942

please provide the solutions ASAP for the attached questions....

Thanks27942

They also gave C but I did not got that. According to me its A.
Because if we consider x=y, then we will have inequality as ((x^2 + 1)/x) > x
I know that at this point we are not knowing sign of x so we can directly cross multiply by x. But if we consider both conditions i.e. x<0 & x>0, then also this inequality give same answer. So why not stmt 1 alone is sufficient..?
Pls correct me if I am wrong..

Try two values x = -1 and x = 1 and see if you get only one answer with statement one alone?

(x^2 + 1 )/x = -2 (when x = -1) which is LESS THAN y (which is equal to x)
(x^2 + 1)/x = 2 (when x = 1 ) which is GREATER THAN y(which is equal to x)

So we cant conclusively say with only 1st statement that its greater or lower unless you know the sign too

i have an inclination towards A as well. If we equate and cross multiply...
Then, for all situations,
((X^2+1)+1) > X^2
Ought to be true right?

Now, the question is...Do we substitute first and then use the condition of do we use the condition and then substitute. Is there any rule for it?

They also gave C but I did not got that. According to me its A.
Because if we consider x=y, then we will have inequality as ((x^2 + 1)/x) > x
I know that at this point we are not knowing sign of x so we can directly cross multiply by x. But if we consider both conditions i.e. x<0 & x>0, then also this inequality give same answer. So why not stmt 1 alone is sufficient..?
Pls correct me if I am wrong..

Try two values x = -1 and x = 1 and see if you get only one answer with statement one alone?

(x^2 + 1 )/x = -2 (when x = -1) which is LESS THAN y (which is equal to x)
(x^2 + 1)/x = 2 (when x = 1 ) which is GREATER THAN y(which is equal to x)

So we cant conclusively say with only 1st statement that its greater or lower unless you know the sign too

ps25 Says

will go with C

They also gave C but I did not got that. According to me its A.
Because if we consider x=y, then we will have inequality as ((x^2 + 1)/x) > x
I know that at this point we are not knowing sign of x so we can directly cross multiply by x. But if we consider both conditions i.e. x<0 & x>0, then also this inequality give same answer. So why not stmt 1 alone is sufficient..?
Pls correct me if I am wrong..

if x is not equal to 0, is ((x^2 + 1)/x) > y?

1. x=y
2. y>0

will go with C

if x is not equal to 0, is ((x^2 + 1)/x) > y?

1. x=y
2. y>0

Hi ps25,

(2.25^2)afkp = dgjm
Now 2.25^2 = (9/4)^2 = 9 ^2/4^2 = 3*3*3*3/2*2*2*2

Therefore dgjm/afkp = 3*3*3*3/2*2*2*2
So, all these alphabets will correspond to either 3 or 2.

Therefore, II is sufficient.

Thanks for correction

2) (2.25^2)afkp = dgjm
5^2 afkp = 2^2dgjm

This means afkp will have one 2^2 and dgjm will have one 5^2

In dgjm j * g can be 5 ^ 2 or 5 * (something !=5 ) or (something !=5 ) *(something !=5 )
In afkp f*k can be 2^2 or 2* (something !=2 ) or (something !=2 )*(something !=2 )

This is not sufficient

So I will go for A

Hi ps25,

(2.25^2)afkp = dgjm
Now 2.25^2 = (9/4)^2 = 9 ^2/4^2 = 3*3*3*3/2*2*2*2

Therefore dgjm/afkp = 3*3*3*3/2*2*2*2
So, all these alphabets will correspond to either 3 or 2.

Therefore, II is sufficient.

a b c d
e f g h
i j k l
m n o p

In the grid above, the variables a through p are each equal to 2, 3, 5, or 7, with exactly one occurrence of each value in any row and in any column. What is the value of fgjk?


(1) bcehilno = 35^4
(2) (2.25^2)afkp = dgjm

PS: (consider it as a 4X4 grid, couldn't draw them using this editor)

a b c d
e f g h
i j k l
m n o p

fgjk = ?

1) bcehilno = 35^4
= (5*7)^5

so (b*c), (e*h), (i*l), (n*o) = 35

e * h = 7*5 or 5*7 so f*g = 2*3 or 3*2
i * l = 7*5 or 5*7 so j*k = 2*3 or 3*2

Sufficient( (3*2)^2 )

2) (2.25^2)afkp = dgjm
5^2 afkp = 2^2dgjm

This means afkp will have one 2^2 and dgjm will have one 5^2

In dgjm j * g can be 5 ^ 2 or 5 * (something !=5 ) or (something !=5 ) *(something !=5 )
In afkp f*k can be 2^2 or 2* (something !=2 ) or (something !=2 )*(something !=2 )

This is not sufficient

So I will go for A

a b c d
e f g h
i j k l
m n o p

In the grid above, the variables a through p are each equal to 2, 3, 5, or 7, with exactly one occurrence of each value in any row and in any column. What is the value of fgjk?


(1) bcehilno = 35^4
(2) (2.25^2)afkp = dgjm

PS: (consider it as a 4X4 grid, couldn't draw them using this editor)

Nice question !!!

My answer is D.

a b c d
e f g h
i j k l
m n o p

In the grid above, the variables a through p are each equal to 2, 3, 5, or 7, with exactly one occurrence of each value in any row and in any column. What is the value of fgjk?


(1) bcehilno = 35^4
(2) (2.25^2)afkp = dgjm

PS: (consider it as a 4X4 grid, couldn't draw them using this editor)

a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p


In the grid above, the variables a through p are each equal to 2, 3, 5, or 7, with exactly one occurrence of each value in any row and in any column. What is the value of fgjk?


(1) bcehilno = 354
(2) (2.252)afkp = dgjm

Q. The integers m and p are such that 2

1 ?

1. the greatest common factor of m and p is 2

2. the least common multiple of m and p is 30

If you take combination of 15 and 30 it will still give u LCM of 30, you get reminder 0. so statement 2 is also not sufficent. Please come up with better explaination.

Is it D?
If you take combination of 15 and 30 it will still give u LCM of 30, you get reminder 0. so statement 2 is also not sufficent. Please come up with better explaination.
QUOTE]

mbaQuest12 Says

Awesome solution! You make it look so simple!

Happy to help, please bring tougher questions of 700+ levels