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

 It is currently 22 Oct 2019, 04:32 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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  Which one of the following numbers can be removed from the set S = {0,

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

Hide Tags

Math Expert V
Joined: 02 Sep 2009
Posts: 58428
Which one of the following numbers can be removed from the set S = {0,  [#permalink]

Show Tags 00:00

Difficulty:   15% (low)

Question Stats: 89% (00:52) correct 11% (00:50) wrong based on 19 sessions

HideShow timer Statistics

Which one of the following numbers can be removed from the set S = {0, 2, 4, 5, 9} without changing the average of set S?

(A) 0
(B) 2
(C) 4
(D) 5
(E) 9

Source: Nova GMAT
Difficulty Level: 600

_________________
Intern  B
Joined: 27 Sep 2018
Posts: 37
Re: Which one of the following numbers can be removed from the set S = {0,  [#permalink]

Show Tags

Avg of given set=(0+2+4+5+9)/5=4

Let the number removed be x so that there is no change in average of set

Now atq (0+2+4+5+9-x)/4=4
Solving for x we get, 20-x=16
X=4

Posted from my mobile device
VP  D
Joined: 31 Oct 2013
Posts: 1465
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: Which one of the following numbers can be removed from the set S = {0,  [#permalink]

Show Tags

Bunuel wrote:
Which one of the following numbers can be removed from the set S = {0, 2, 4, 5, 9} without changing the average of set S?

(A) 0
(B) 2
(C) 4
(D) 5
(E) 9

Average of the set = 0 + 2 + 4 + 5 + 9 / 5 = 4

Average will remain same if we remove 4.

Sum of the set = 0 + 2 + 4 + 5 + 9 = 20

20 - 4 / 4 = 4.

Thus C is the correct answer.
Intern  B
Joined: 29 Nov 2018
Posts: 2
Re: Which one of the following numbers can be removed from the set S = {0,  [#permalink]

Show Tags

(0+2+4+5+9)/5=4
Lets remove 0
(2+4+5+9)/5=4
Manager  S
Joined: 19 Jan 2019
Posts: 93
Re: Which one of the following numbers can be removed from the set S = {0,  [#permalink]

Show Tags

djdli wrote:
(0+2+4+5+9)/5=4
Lets remove 0
(2+4+5+9)/5=4

2,4,5 and 9 are 4 terms....

(2+4+5+9)/4 = 5.... Not 4

Posted from my mobile device
GMAT Club Legend  D
Joined: 18 Aug 2017
Posts: 5031
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: Which one of the following numbers can be removed from the set S = {0,  [#permalink]

Show Tags

Bunuel wrote:
Which one of the following numbers can be removed from the set S = {0, 2, 4, 5, 9} without changing the average of set S?

(A) 0
(B) 2
(C) 4
(D) 5
(E) 9

sum of no S = {0, 2, 4, 5, 9} 20 and avg = 4
so target is to remove a no and get same avg or say total = 4*4 ; 16
so remove 4 we get sum = 16
IMO C
Manager  S
Joined: 11 Feb 2013
Posts: 147
GMAT 1: 490 Q44 V15 GMAT 2: 690 Q47 V38 GPA: 3.05
WE: Analyst (Commercial Banking)
Re: Which one of the following numbers can be removed from the set S = {0,  [#permalink]

Show Tags

djdli wrote:
(0+2+4+5+9)/5=4
Lets remove 0
(2+4+5+9)/5=4

If u remove zero, the number of remaining numbers is four.
Thus new mean =20/4=5 which is NOT EQUAL to existing mean (4).
Thus, u should not remove ZERO for getting the same mean.

Posted from my mobile device Re: Which one of the following numbers can be removed from the set S = {0,   [#permalink] 10 Apr 2019, 01:54
Display posts from previous: Sort by

Which one of the following numbers can be removed from the set S = {0,

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

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