• 1 Hour Free
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

• 5 Day FREE Trial
Study Smarter, Not Harder

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

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

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

• Get 300+ Practice Questions

Available with Beat the GMAT members only code

• Free Trial & Practice Exam
BEAT THE GMAT EXCLUSIVE

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 • FREE GMAT Exam Know how you'd score today for$0

Available with Beat the GMAT members only code

## Is z an odd integer?

This topic has 1 expert reply and 0 member replies
BTGmoderatorDC Moderator
Joined
07 Sep 2017
Posted:
710 messages
Followed by:
4 members

#### Is z an odd integer?

Wed Nov 08, 2017 4:56 am
Is z an odd integer?

(1) z is divisible by 3.
(2) The square root of z is an integer divisible by 3.

Isn't statement 1 sufficient?

OA E

### GMAT/MBA Expert

ceilidh.erickson GMAT Instructor
Joined
04 Dec 2012
Posted:
1805 messages
Followed by:
230 members
1443
Wed Nov 08, 2017 12:22 pm
Try TESTING CASES here:

Is z an odd integer?

(1) z is divisible by 3.

If z = 9, then yes: z is odd.
If z = 6, then no: z is not odd.

We tested 2 values that both fit the statement, and we got one yes and one no. Insufficient.

(2) The square root of z is an integer divisible by 3.
If the square root of z is divisible by 3, then z must be a perfect square that is divisible by 3. Again, test cases that fit:
If z = 9, then yes: z is odd.
If z = 36, then no: z is not odd.
Insufficient.

Putting the statements together does not help, because we already know statement 1 in knowing statement 2. Therefore, the answer must be E.

_________________

Ceilidh Erickson
Manhattan Prep GMAT & GRE instructor
EdM in Mind, Brain, and Education

Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience.
Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry!

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

### Top First Responders*

1 GMATGuruNY 72 first replies
2 Rich.C@EMPOWERgma... 45 first replies
3 Brent@GMATPrepNow 43 first replies
4 Jay@ManhattanReview 27 first replies
5 ErikaPrepScholar 9 first replies
* Only counts replies to topics started in last 30 days
See More Top Beat The GMAT Members

### Most Active Experts

1 GMATGuruNY

The Princeton Review Teacher

133 posts
2 Rich.C@EMPOWERgma...

EMPOWERgmat

118 posts
3 Jeff@TargetTestPrep

Target Test Prep

105 posts
4 Max@Math Revolution

Math Revolution

93 posts
5 Scott@TargetTestPrep

Target Test Prep

92 posts
See More Top Beat The GMAT Experts