GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 18 Oct 2019, 06:38

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.

Close

Request Expert Reply

Confirm Cancel

The sum of the non-prime numbers between 40 and 50, non-inclusive, is

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58453
The sum of the non-prime numbers between 40 and 50, non-inclusive, is  [#permalink]

Show Tags

New post 12 Aug 2016, 09:04
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

72% (01:25) correct 28% (01:10) wrong based on 109 sessions

HideShow timer Statistics

Senior Manager
Senior Manager
avatar
Joined: 23 Apr 2015
Posts: 285
Location: United States
Concentration: General Management, International Business
WE: Engineering (Consulting)
Re: The sum of the non-prime numbers between 40 and 50, non-inclusive, is  [#permalink]

Show Tags

New post 12 Aug 2016, 09:11
The sum of the non-prime numbers between 40 and 50, non-inclusive, are {42, 44, 45, 46, 48, 49}. 6 times 40 something is approx north of 240 and Hence the answer is (C) 274
Board of Directors
User avatar
V
Status: Stepping into my 10 years long dream
Joined: 18 Jul 2015
Posts: 3580
Reviews Badge
Re: The sum of the non-prime numbers between 40 and 50, non-inclusive, is  [#permalink]

Show Tags

New post 12 Aug 2016, 10:33
1
Bunuel wrote:
The sum of the non-prime numbers between 40 and 50, non-inclusive, is

A. 131
B. 176
C. 274
D. 405
E. 495


Once we get the Non prime numbers, no need to sum all. Just find the sum of Unit digits, we will get 4 at the end. Hence, answer C
_________________
My LinkedIn abhimahna.
My GMAT Story: From V21 to V40
My MBA Journey: My 10 years long MBA Dream
My Secret Hacks: Best way to use GMATClub | Importance of an Error Log!
Verbal Resources: All SC Resources at one place | All CR Resources at one place
Blog: Subscribe to Question of the Day Blog
GMAT Club Inbuilt Error Log Functionality - View More.
New Visa Forum - Ask all your Visa Related Questions - here.
New! Best Reply Functionality on GMAT Club!
Find a bug in the new email templates and get rewarded with 2 weeks of GMATClub Tests for free
Check our new About Us Page here.
Manager
Manager
avatar
G
Joined: 02 Jun 2015
Posts: 184
Location: Ghana
Re: The sum of the non-prime numbers between 40 and 50, non-inclusive, is  [#permalink]

Show Tags

New post 12 Aug 2016, 12:09
1
Bunuel wrote:
The sum of the non-prime numbers between 40 and 50, non-inclusive, is

A. 131
B. 176
C. 274
D. 405
E. 495


sum of consecutive integers from 41 to 49, inclusive ====> (A1 + An)/2 * # of terms = (41 + 49)/2 * 9 = 45 *9 = 405

sum of non-prime numbers b/w 40 and 50, non inclusive ===> 405 - 131 (i.e., 41 + 43 +47, being the prime #s in the range) =274

Answer: C
_________________
Kindly press kudos if you find my post helpful
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 13257
Re: The sum of the non-prime numbers between 40 and 50, non-inclusive, is  [#permalink]

Show Tags

New post 09 Mar 2019, 01:52
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Club Bot
Re: The sum of the non-prime numbers between 40 and 50, non-inclusive, is   [#permalink] 09 Mar 2019, 01:52
Display posts from previous: Sort by

The sum of the non-prime numbers between 40 and 50, non-inclusive, is

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





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