BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

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.

★★★★★5.0559 reviews
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
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
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start 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 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

What would be the quickest way to solve this?

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Senior | Next Rank: 100 Posts
Posts: 48
Joined: Wed Oct 30, 2013 7:54 amFollowed by: 1 member
by NeilWatson » Tue Feb 18, 2014 7:08 pm
I believe this problem might be pretty straight forward, but I got it wrong :/

If N is a positive integer, is the units digit of N equal to 0?
1) 14 and 35 are factors of N

2) N = (2^5)(3^2)(5^7)(7^6)

I know the answer but would like a formal explanation.

Thanks
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
Senior | Next Rank: 100 Posts
Posts: 48
Joined: Mon May 23, 2011 9:18 amFollowed by: 4 members
Location: NYC
Thanked: 17 times
GMAT Score:770

by dimochka » Tue Feb 18, 2014 9:22 pm
Hi NeilWatson,

Looking at (1) we know that N is divisible by 14 and 35.
If a number is divisible by 14, it's divisible by both 2 and 7
If a number is divisible by 35, it's divisible by both 5 and 7
Since N is divisible by 2 and by 5, it has to be divisible by 2*5 = 10, and therefore must end with a 0.
Sufficient

(2) Same logic applies. As it is divisible by at least one 2 and one 5, it is divisible by 10 and will therefore end with at least one 0.
Sufficient
Please feel free to private message me with any questions; I don't check the forums regularly, whereas PMs go straight to my email.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 1052
Joined: Fri May 21, 2010 1:30 amFollowed by: 98 members
Thanked: 335 times

by Patrick_GMATFix » Tue Feb 18, 2014 9:38 pm
An integer with a units digit of 0 must be divisible by 10. An integer is divisible by 10 if it has 2 and 5 among its factors.

Rephrase: Are 2 and 5 both factors of N?

(1) 2 must be a factor because 14 (2*7) is. 5 must be a factor because 35 is. SUFFICIENT

(2) This gives us the exact value of N, so it must be SUFFICIENT.

Answer is D

-Patrick
  • Ask me about tutoring.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1