Find all School-related info fast with the new School-Specific MBA Forum

It is currently 29 Jul 2014, 10:59

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

In a sequence of 10 increasing consecutive integers, the sum

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 22 Sep 2005
Posts: 280
Followers: 1

Kudos [?]: 37 [0], given: 1

GMAT Tests User
In a sequence of 10 increasing consecutive integers, the sum [#permalink] New post 14 Nov 2006, 12:31
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

54% (02:23) correct 46% (01:22) wrong based on 18 sessions
In a sequence of 10 increasing consecutive integers, the sum of the last 5 integers is 230. What is the sum of the first 5 integers in the sequence?

A) 225

B) 220

C) 215

D) 210

E) 205
Manager
Manager
avatar
Joined: 29 Aug 2006
Posts: 158
Followers: 1

Kudos [?]: 1 [0], given: 0

GMAT Tests User
 [#permalink] New post 14 Nov 2006, 12:41
E from me.
let the int be x, x+1, x+2....x+9.

x+5+x+6+x+7+x+8+x+9=230
5x+35=230
x=39

sum of first 5=205
Manager
Manager
avatar
Joined: 10 Jul 2006
Posts: 75
Followers: 1

Kudos [?]: 2 [0], given: 0

GMAT Tests User
 [#permalink] New post 14 Nov 2006, 19:32
Answer E.

Let the first 5 number in this sequence be n, n+1, n+2, n+3, n+4. Sum = 5n +10.

Let the last 5 numbers in the sequence be n+5, n+6, n+7, n+8, n+9. Sum= 5n+35.

Since 5n+35 = 230 and we need to find 5n+10. subtract 25 from 230, we have 205 => E
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 5097
Location: Singapore
Followers: 16

Kudos [?]: 131 [0], given: 0

GMAT Tests User
 [#permalink] New post 14 Nov 2006, 21:28
First integer, x
Second integer, X+1
third interger, x+2 and so on...

Sum of last five integers is:
x+5 + x+6 + x+7 + x+8 + x+9 = 5x + 35 = 230 --> x = 39

so sum of first five integers is:
x + x+1 + x+2 + x+3 + x+4 = 5x + 10 = 205

ans E
Manager
Manager
User avatar
Joined: 03 Jul 2005
Posts: 195
Location: City
Followers: 1

Kudos [?]: 2 [0], given: 0

GMAT Tests User
 [#permalink] New post 14 Nov 2006, 22:19
Divide 230 by 5 = 46, this is the eighth term, then count back to find the first five and then add.

A:39
B:40
C:41
D:42
E:43
F:44
G:45
H:46
I:47
J:48

If you use formulas it might be quicker, but it's just another way.
Intern
Intern
avatar
Joined: 10 Jun 2009
Posts: 31
Location: Stockholm, Sweden
Followers: 0

Kudos [?]: 1 [0], given: 0

Re: PS: Sequence [#permalink] New post 16 Jun 2009, 03:11
The quickest way is first to divide 230 by 5 (to get the mean of the 5 largest numbers) and then subtract 5 from that number and multiply by 5.

Answer is E
Re: PS: Sequence   [#permalink] 16 Jun 2009, 03:11
    Similar topics Author Replies Last post
Similar
Topics:
5 Experts publish their posts in the topic In an increasing sequence of 10 consecutive integers, the Walkabout 7 07 Dec 2012, 03:31
1 Experts publish their posts in the topic In an increasing set of 7 consecutive integers, the sum of t Archit143 6 05 Nov 2012, 11:02
4 Experts publish their posts in the topic In an increasing sequence of 10 consecutive integers, the su MBAhereIcome 7 30 Aug 2011, 02:59
Experts publish their posts in the topic PS: Sum of Consecutive Integers rajpdsouza 4 28 Nov 2007, 06:11
If a sequence of consecutive integers of increasing value ggarr 5 23 Oct 2006, 01:23
Display posts from previous: Sort by

In a sequence of 10 increasing consecutive integers, the sum

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.