It is currently 19 Nov 2017, 09:05

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# What is the sum of the first 50 common numbers between the

Author Message
Retired Moderator
Joined: 05 Jul 2006
Posts: 1749

Kudos [?]: 442 [0], given: 49

What is the sum of the first 50 common numbers between the [#permalink]

### Show Tags

12 Oct 2006, 16:43
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

What is the sum of the first 50 common numbers between the series 15,19,23....... and 14,19,24.........?

A) 25550
B) 24540
C) 24450
D) 25450
E) 25540

Kudos [?]: 442 [0], given: 49

Senior Manager
Joined: 31 Jul 2006
Posts: 440

Kudos [?]: 56 [0], given: 0

### Show Tags

12 Oct 2006, 17:54
yezz wrote:
What is the sum of the first 50 common numbers between the series 15,19,23....... and 14,19,24.........?

A) 25550
B) 24540
C) 24450
D) 25450
E) 25540

series1 is every 4, series2 is every 5, so LCM is 20, so its 19, 39,59,79

so 19+49*20= 19+980=999

Avg*#of terms=sum, so 19+999/2 * 50 = 1018/2 * 50 = 509 * 50 = 25450
D

Kudos [?]: 56 [0], given: 0

VP
Joined: 25 Jun 2006
Posts: 1161

Kudos [?]: 203 [0], given: 0

### Show Tags

12 Oct 2006, 18:40
agree with teh above. D is right.

Kudos [?]: 203 [0], given: 0

Director
Joined: 23 Jun 2005
Posts: 838

Kudos [?]: 87 [0], given: 1

GMAT 1: 740 Q48 V42

### Show Tags

12 Oct 2006, 18:56
yezz wrote:
What is the sum of the first 50 common numbers between the series 15,19,23....... and 14,19,24.........?

A) 25550
B) 24540
C) 24450
D) 25450
E) 25540

It's D.

Series with difference d1 =4 and d2=5
So, common terms will be with a difference of LCM of 4 and 5 =20

Sum of first 50 terms = 50/2(2*19 + (50-1)20)

Simplify to get
25450

Kudos [?]: 87 [0], given: 1

Re: Sum of Intigers   [#permalink] 12 Oct 2006, 18:56
Display posts from previous: Sort by

# What is the sum of the first 50 common numbers between the

Moderator: chetan2u

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne 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®.