Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 563 reviewsTarget Test Prep

Factor Problem: PR Manual

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic

Which answer to the problem below is correct?

Poll ended at Thu Feb 12, 2009 7:16 am

(d)
1
20%
(b)
0
No votes
both (b) and (d)
4
80%
 
Total votes: 5
User avatar
Master | Next Rank: 500 Posts
Posts: 229
Joined: Tue Jan 13, 2009 6:56 am
Thanked: 8 times
GMAT Score:700
by Uri » Tue Jan 13, 2009 7:16 am
It's a problem from PR manual.

If 65x = 3^2 × 5^2 × 13, which of the following is not a factor of x?
(a)3
(b)6
(c)9
(d)13
(e)15

Official Answer: [spoiler](d)[/spoiler]

I feel that it can be both (d) or (b). What do you think?
Top
Join the discussion
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 73
Joined: Wed Jan 07, 2009 1:00 pm
Location: Tampa, FL
Thanked: 9 times
GMAT Score:630

by Mr2Bits » Tue Jan 13, 2009 8:15 am
Solve for x

65x = 9*25*13 = 2925

65x = 2925

x=45

45 cannot be divided by 6 and 13 both B and D are correct
Top
Join the discussion
Legendary Member
Posts: 1169
Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member
Thanked: 25 times

by aj5105 » Tue Jan 13, 2009 8:22 am
5*13 X = 3^2 * 5^2 * 13
X =3^2 * 5

(b) & (d)
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 229
Joined: Tue Jan 13, 2009 6:56 am
Thanked: 8 times
GMAT Score:700

Thanks!

by Uri » Tue Jan 13, 2009 10:21 am
Thanks for the replies aj5105 and Mr2Bits.

I took the approach of aj5105. But perhaps simplifying after the last step (x=45) can make things clearer, which Mr2Bits has done. Still, simplifying in the very first step is too time consuming. Once we get X=45, we can easily understand that the PR Review Manual made mistakes :wink: In fact, I have found few others too there and could not believe myself. That is why I posted this one. Thanks a lot once again to both of you :D
Top
Join the discussion