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. x0, 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
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. x0, 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?
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....
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 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
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 ?
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.
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.
@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.
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!!
@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!!
Dude, its obvious that they mean 30 days, and OG's reasoning is justified.. Try to analyze the question like this.
We need the total amount which will be given to red cross charity i.e. we need the value of "nx" , where 'n' total number of cars to be sold in 30 days of time.
From statement1, we will get 500X and not getting the exact number.
From statement2, we will get (n+60)x = 28000. Now, we know n=500. So, (500+60)x = 28000 and from here we will get the value of x, and correspondingly for "nx"
Let me know if you need any further clarification..
@[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.
@[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 ?
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?
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.
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.
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.