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 Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 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
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
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 Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget 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.

sequences and series

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 37
Joined: Sat Apr 24, 2010 8:27 am
by GmatTakerNo.1 » Mon May 03, 2010 5:31 am
Hey, can you please show me the way to answer this question with step by step explanations.

In a series of 10 consecutive integers what is the sum of the first 5 integers if the sum of the last 5 is 375?

The answer is 350.

Thank you in advance.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Legendary Member
Posts: 759
Joined: Mon Apr 26, 2010 10:15 amFollowed by: 3 members
Thanked: 85 times

by clock60 » Mon May 03, 2010 5:39 am
GmatTakerNo.1 wrote:Hey, can you please show me the way to answer this question with step by step explanations.

In a series of 10 consecutive integers what is the sum of the first 5 integers if the sum of the last 5 is 375?

The answer is 350.

Thank you in advance.
i think there are many ways to solve this
one way
x, x+1, x+2,.......x+9

mean of last 5 terms=x+7, so sum=5*(x+7)=375, and x=68
mean of first 5 terms=x+2, so sum=5*(68+2)=5*70=350
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 1179
Joined: Sun Apr 11, 2010 9:07 pmFollowed by: 88 members
Location: Milpitas, CA
Thanked: 447 times

by Rahul@gurome » Mon May 03, 2010 5:54 am
Let the integers be n, n+1, n+2, n+3............n + 9.
Sum of last five integers is (n+5)+(n+6)+(n+7)+(n+8)+(n+9) which is 5n+35.
Or 5n+35= 375.
Or 5n= 340.
So sum of first five integers is n+(n+1)+(n+2)+(n+3)+(n+4) = 5n+10 = 340+10 = 350
Rahul Lakhani
Quant Expert
Gurome, Inc.
https://www.GuroMe.com
On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 526
Joined: Sat Feb 21, 2009 11:47 pm
Location: India
Thanked: 68 times
GMAT Score:680

by harshavardhanc » Mon May 03, 2010 6:34 am
GmatTakerNo.1 wrote:Hey, can you please show me the way to answer this question with step by step explanations.

In a series of 10 consecutive integers what is the sum of the first 5 integers if the sum of the last 5 is 375?

The answer is 350.

Thank you in advance.
another way to look at it :

->the difference of the 5th and the 6th term will be 1.
->the difference of the 4th and the 7th term will be 3.
->the difference of the 3rd and the 8th term will be 5.
->the difference of the 2nd and the 9th term will be 7.
->the difference of the 1st and the 10th term will be 9.

so the sum of the last 5 terms is greater than the sum of first 5 terms by an amount which is equal to (1+3+5+7+9) OR 25 .

P.S : sum of first n odd integers is n^2
Regards,
Harsha
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 32
Joined: Sun Aug 10, 2008 5:36 am
Thanked: 1 times

by susantaiitk » Mon May 03, 2010 7:01 am
there is a phase shift of 5 for each number between first 5 and last 5.

take example of 1,2,3,4,5
6,7,8,9,10


hence sum of first 5 = sum of last 5 - 5*5 = 350
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 758
Joined: Sat Aug 29, 2009 9:32 pmFollowed by: 2 members
Location: Bangalore,India
Thanked: 67 times

by sumanr84 » Mon May 03, 2010 9:00 am
Although its good to know for knowledge and you may differ in opinion, but Series questions are not asked in GMAT.

Don't put too much of your head into it.
I am on a break !!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 526
Joined: Sat Feb 21, 2009 11:47 pm
Location: India
Thanked: 68 times
GMAT Score:680

by harshavardhanc » Mon May 03, 2010 9:09 am
sumanr84 wrote:Although its good to know for knowledge and you may differ in opinion, but Series questions are not asked in GMAT.

Don't put too much of your head into it.
i'm really sorry Suman! follow the link below and see what beautiful question this is :

https://www.beatthegmat.com/post206511.html#206511

it's based on series. Although, you need not know all the concepts of progressions in this one, but still ... it will surely help if you know one or two.
Regards,
Harsha
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1