• Free Trial & Practice Exam
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• Free Veritas GMAT Class
Experience Lesson 1 Live Free

Available with Beat the GMAT members only code

• Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

• Free Practice Test & Review
How would you score if you took the GMAT

Available with Beat the GMAT members only code

• 1 Hour Free
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• Get 300+ Practice Questions

Available with Beat the GMAT members only code

• Reach higher with Artificial Intelligence. Guaranteed
Now free for 30 days

Available with Beat the GMAT members only code

• 5-Day Free Trial
5-day free, full-access trial TTP Quant

Available with Beat the GMAT members only code

• Award-winning private GMAT tutoring
Register now and save up to \$200

Available with Beat the GMAT members only code

• 5 Day FREE Trial
Study Smarter, Not Harder

Available with Beat the GMAT members only code

Problem 14 Section 11 of 100DS

Joined
10 Dec 2006
Posted:
363 messages
Followed by:
2 members
7

Problem 14 Section 11 of 100DS

Thu Jan 25, 2007 3:44 pm
If a and b are positive integers, is a/b=2/3?

(1) 3a = 2b
(2) For integers m and n, a = 2m and b = 3n

Is not D the the answer? if you substitute 2m by a and 3n by b the result is m=n.

_________________

Cybermusings Legendary Member
Joined
27 Mar 2007
Posted:
559 messages
Followed by:
2 members
5
Wed Mar 28, 2007 5:15 am
If a and b are positive integers, is a/b=2/3?

(1) 3a = 2b
(2) For integers m and n, a = 2m and b = 3n

3a = 2b

Thus a/b = 2/3

Hence I is sufficient

a = 2m and b = 3n

Thus a/ b = 2m/3n

But here a/b will be equal to 2/3 if m = n

Hence it may or may not be true

Hence II is insufficient

Thus A

GMAT/MBA Expert

Stacey Koprince GMAT Instructor
Joined
27 Dec 2006
Posted:
2228 messages
Followed by:
681 members
639
GMAT Score:
780
Wed Jan 31, 2007 5:08 pm
yes/no: is a/b = 2/3

(1) 3a = 2b. Can be rearranged to a/b = 2/3. Yes.

(2) a = 2m, b = 3n, m and n are integers. So a/b = 2m/3n. We don't know what m and n are; we only know they are integers.

Nor do we know that m = n; we can't just substitute into the equation given in the question stem b/c we don't know that that equation is true - the point is that we're being asked to determine whether it is true. m could equal n IF that equation is true (that is, if a/b = 2/3 is true). But if it isn't true, then m and n can be any integers. So can't tell for sure.

_________________
Please note: I do not use the Private Messaging system! I will not see any PMs that you send to me!!

Stacey Koprince
GMAT Instructor
Director of Online Community
Manhattan GMAT

Contributor to Beat The GMAT!

Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week.

Best Conversation Starters

1 lheiannie07 80 topics
2 LUANDATO 59 topics
3 ardz24 52 topics
4 AAPL 45 topics
5 Roland2rule 43 topics
See More Top Beat The GMAT Members...

Most Active Experts

1 Rich.C@EMPOWERgma...

EMPOWERgmat

133 posts
2 Brent@GMATPrepNow

GMAT Prep Now Teacher

131 posts
3 GMATGuruNY

The Princeton Review Teacher

130 posts
4 Scott@TargetTestPrep

Target Test Prep

118 posts
5 Jeff@TargetTestPrep

Target Test Prep

114 posts
See More Top Beat The GMAT Experts