Last visit was: 20 Jul 2025, 05:01 It is currently 20 Jul 2025, 05:01
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
User avatar
Maude
Joined: 16 Jun 2010
Last visit: 10 Sep 2010
Posts: 2
Own Kudos:
59
 [54]
Given Kudos: 2
Posts: 2
Kudos: 59
 [54]
1
Kudos
Add Kudos
53
Bookmarks
Bookmark this Post
Most Helpful Reply
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 19 Jul 2025
Posts: 102,627
Own Kudos:
742,922
 [9]
Given Kudos: 98,235
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 102,627
Kudos: 742,922
 [9]
4
Kudos
Add Kudos
5
Bookmarks
Bookmark this Post
User avatar
stanford2012
Joined: 02 Apr 2010
Last visit: 09 Mar 2012
Posts: 78
Own Kudos:
281
 [5]
Given Kudos: 18
Posts: 78
Kudos: 281
 [5]
2
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
General Discussion
User avatar
pranrasvij
Joined: 15 Apr 2010
Last visit: 30 May 2013
Posts: 131
Own Kudos:
23
 [1]
Given Kudos: 29
Posts: 131
Kudos: 23
 [1]
Kudos
Add Kudos
Bookmarks
Bookmark this Post
both statements essentially say the same thing.. ratio: a:b=7:10 => 10a=7b;

now just plug in some values to see if you can get any definitive answers:

assume a=7, b=10 or a=14, b=20 and so on.... (a< b)

but there are negative answers as well.... a=-7, b=-10 => a > b

I would go with E.....
User avatar
MathRevolution
User avatar
Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Last visit: 27 Sep 2022
Posts: 10,078
Own Kudos:
Given Kudos: 4
GMAT 1: 760 Q51 V42
GPA: 3.82
Expert
Expert reply
GMAT 1: 760 Q51 V42
Posts: 10,078
Kudos: 18,763
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Forget conventional ways of solving math questions. In DS, Variable approach is

the easiest and quickest way to find the answer without actually solving the

problem. Remember equal number of variables and equations ensures a solution.


Is a > b ?

(1) a/b = 7/10

(2) a = 70/100*b
==> transforming the original condition and the question using variable approach method, we have 2 variables (a,b) and in order to match the number of variables and equations we need 2 equations. Since there is 1 each in 1) and 2), C is likely the answer.

Using both 1) & 2) together, the answer is yes if a=-7, b=10, while the answer is no if a=7, b=10. Since the conditions and not suffiicent. the answer is E
User avatar
push12345
Joined: 02 Oct 2017
Last visit: 10 Feb 2019
Posts: 547
Own Kudos:
Given Kudos: 14
Posts: 547
Kudos: 525
Kudos
Add Kudos
Bookmarks
Bookmark this Post
(1) a/b = 7/10

Given only ratio
If multiplied term is negative then a>b
but if multiplied term is positive then b>a

Multiple cases so insufficient

(2) a = 70/100*b

rearranging gives statement 1 only
so insufficient

E is answer

Give kudos if it helps
User avatar
Bismarck
Joined: 18 Jun 2018
Last visit: 15 Mar 2023
Posts: 217
Own Kudos:
Given Kudos: 35
Posts: 217
Kudos: 455
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Maude
Is a > b ?

(1) a/b = 7/10

(2) a = 70/100*b

Is \(a>b \quad?\)

(1) \(\frac{a}{b} = \frac{7}{10}\)

Taking \(a = 7\) and \(b = 10,\quad \frac{a}{b}=\frac{7}{10}\)

Is \(a>b ? : No\) ; as \(7<10\).

Taking \(a = - 7\) and \(b = -10,\quad \frac{a}{b} = \frac{-7}{-10}=\frac{7}{10}\)

Is \(a>b ? : Yes\) ; as \(-7>-10\).

Statement \(1\) alone is not sufficient.

(2) \(a = \frac{70}{100}*b\)

\(a = \frac{70}{100}*b\) can be reduced to \(a = \frac{7}{10} *b\)

Taking \(a = 7\) and \(b = 10,\quad a=\frac{7}{10}*b\)

Is \(a>b ? : No\) ; as \(7<10\).

Taking \(a = - 7\) and \(b = -10,\quad a = \frac{7}{10}b\)

Is \(a>b ? : Yes\) ; as \(-7>-10\)

Statement \(2\) alone is not sufficient.

As Statement (1) and statement (2) are the same with only exception that in statement 1, b cannot be zero while statement 2, b can be 0.
Combining both will also be insufficient to answer: Is a > b ?
avatar
OjhaShishir
Joined: 19 Dec 2019
Last visit: 10 Mar 2021
Posts: 31
Own Kudos:
Given Kudos: 6
Posts: 31
Kudos: 20
Kudos
Add Kudos
Bookmarks
Bookmark this Post
This does not look like a 700 level question to me at all.
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 19 Jul 2025
Posts: 102,627
Own Kudos:
Given Kudos: 98,235
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 102,627
Kudos: 742,922
Kudos
Add Kudos
Bookmarks
Bookmark this Post
OjhaShishir
This does not look like a 700 level question to me at all.

The difficulty level of a question is calculated automatically based on the timer stats from the users which attempted the question. Based on 371 sessions it IS a 700 question.
avatar
OjhaShishir
Joined: 19 Dec 2019
Last visit: 10 Mar 2021
Posts: 31
Own Kudos:
Given Kudos: 6
Posts: 31
Kudos: 20
Kudos
Add Kudos
Bookmarks
Bookmark this Post
ok thanks Bunuel for letting me know. I wasn't aware of the mechanism to allocate the difficulty level to a question.
User avatar
arbazfatmi1994
Joined: 05 Jul 2022
Last visit: 16 Jan 2024
Posts: 104
Own Kudos:
Given Kudos: 31
Location: India
WE:Advertising (Healthcare/Pharmaceuticals)
Products:
Posts: 104
Kudos: 17
Kudos
Add Kudos
Bookmarks
Bookmark this Post
A and B both share the same sign, i.e. both can be positive or both can be negative.

So both possibilities are there A>B OR B>A

Hence 1 is not sufficient

2 is not sufficient, obviously

Hence E
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 37,454
Own Kudos:
Posts: 37,454
Kudos: 1,013
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Moderators:
Math Expert
102627 posts
455 posts