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

It is currently 23 Oct 2019, 11:14

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

A set of 15 different integers has median of 25 and a range

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

Hide Tags

Find Similar Topics 
Manager
Manager
avatar
Joined: 15 Jul 2008
Posts: 153
A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post Updated on: 14 Aug 2014, 01:15
8
101
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

59% (01:40) correct 41% (01:31) wrong based on 1031 sessions

HideShow timer Statistics

A set of 15 different integers has median of 25 and a range of 25. What is greatest possible integer that could be in this set?

A. 32
B. 37
C. 40
D. 43
E. 50

Originally posted by bhushangiri on 12 Aug 2008, 04:50.
Last edited by Bunuel on 14 Aug 2014, 01:15, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
Most Helpful Expert Reply
EMPOWERgmat Instructor
User avatar
V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 15316
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 18 Aug 2015, 22:27
14
13
Hi All,

When it comes to maximizing or minimizing a value in a group of numbers, you have to think about what the other numbers would need to be to accomplish your goal.

Here, we have a group of 15 DISTINCT (meaning DIFFERENT) integers with a median of 25 and a RANGE of 25. That range will dictate how large the largest value can be.

With a median of 25, we know that 7 numbers are LESS than 25 and 7 numbers are GREATER than 25:

_ _ _ _ _ _ _ 25 _ _ _ _ _ _ _

To maximize the largest value, we need to maximize the smallest value. Here's how we can do it:

18 19 20 21 22 23 24 25 _ _ _ _ _ _ _

With 18 as the smallest value, and a range of 25, the largest value would be 43.

Final Answer:

GMAT assassins aren't born, they're made,
Rich
_________________
Contact Rich at: Rich.C@empowergmat.com
Image


The Course Used By GMAT Club Moderators To Earn 750+

souvik101990 Score: 760 Q50 V42 ★★★★★
ENGRTOMBA2018 Score: 750 Q49 V44 ★★★★★
Most Helpful Community Reply
Current Student
User avatar
Joined: 03 Aug 2006
Posts: 82
Location: Next to Google
Schools: Haas School of Business
Re: set of 15 integers  [#permalink]

Show Tags

New post 12 Jun 2009, 13:01
27
1
15
The correct answer is D.

A set of 15 different integers has median of 25 and a range of 25. What is greatest possible integer that could be in this set?

Given 15 different integers, lets say

n1, n2, n3, n4, n5, n6, n7, n8, n9, n10, n11, n12, n13, n14, n15

Also given median is 25 i.e. n8 = 25

n1, n2, n3, n4, n5, n6, n7, 25, n9, n10, n11, n12, n13, n14, n15

As each integer is different we need to find the maximum values for all those numbers before the median.

the maximum value n7 can have is one less then the median i.e. 24, similarly n6 will be one less than 24 i.e. 23 ... using this process the values for all number before the median would be..

18, 19, 20, 21, 22, 23, 24, 25, n9, n10, n11, n12, n13, n14, n15

Also given the range is 25 i.e. n15 - n1 (18) = 25
The maximum value n15 can have is 25 + n1 (18) = 43
General Discussion
Director
Director
avatar
Joined: 14 Aug 2007
Posts: 521
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 12 Aug 2008, 05:16
5
2
bhushangiri wrote:
A set of 15 different integers has median 25 and range 25. What could be the greatest possible integer in this set ?

OA is 43.

How 43 ? I am getting 50.


50 can not be the highest number.

for the range to be 25, (50 - least number) = 25, i.e least number is 25
But it's given that 25 is median and since each number is different, there must be 7 smaller numbers than 25
Director
Director
avatar
Status: There is always something new !!
Affiliations: PMI,QAI Global,eXampleCG
Joined: 08 May 2009
Posts: 846
Re: set of 15 integers  [#permalink]

Show Tags

New post 18 May 2011, 00:11
2
2
8 different numbers from 1st to 8th number gives lowest number = 25-8= 18
hence max number = 18+25 = 43.
Intern
Intern
avatar
Joined: 11 Aug 2013
Posts: 3
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 02 Sep 2013, 14:05
1
bhushangiri wrote:
A set of 15 different integers has median 25 and range 25. What could be the greatest possible integer in this set ?

OA is 43.

How 43 ? I am getting 50.







Try to right down 25 in the middle as a median and 7 numbers to the left and 7 nubers to the right.
You will see clearly that the minimum possible least number is 18 to the left of 25.
Hence 18+25 -->43

18 19 20 21 22 23 24 25 ....... --> the least possible
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58464
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 02 Sep 2013, 14:26
3
4
bhushangiri wrote:
A set of 15 different integers has median 25 and range 25. What could be the greatest possible integer in this set ?

OA is 43.

How 43 ? I am getting 50.


Similar question to practice:
Quote:
A set of 25 different integers has a median of 50 and a range of 50. What is the greatest possible integer that could be in this set?

(A) 62
(B) 68
(C) 75
(D) 88
(E) 100


Discussed here: a-set-of-25-different-integers-has-a-median-of-50-and-a-129345.html

Variation of this question: a-set-of-25-integers-has-a-median-of-50-and-a-range-of-128463.html
_________________
Manager
Manager
User avatar
B
Joined: 17 Jun 2015
Posts: 195
GMAT 1: 540 Q39 V26
GMAT 2: 680 Q46 V37
GMAT ToolKit User
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 28 Dec 2015, 07:33
5
The largest in the set minus the smallest in the set should be 25
All the integers are different

Use the options. If 50 is the largest and the range is 25, the smallest is 25, which could have been if the integers were allowed to be same in the set.


Next option to check is 43. 43 - 25 = 18. Can 18 be a part of the set and at the same time there are no repetitions and 25 is the median? Yes

18, 19, 20, 21, 22, 23, 25, 6 more numbers, 43

Hence D
_________________
Fais de ta vie un rêve et d'un rêve une réalité
EMPOWERgmat Instructor
User avatar
V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 15316
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 28 Dec 2015, 17:47
1
Hi hdwnkr,

Excellent use of TESTing THE ANSWERS! While that approach isn't nearly as useful overall as TESTing VALUES or the frequent 'math' approaches that will always be an option, it WILL be applicable at least a handful of times on Test Day. Having that approach in your skill-set will help you to quickly (and correctly) solve those few questions and move on with confidence.

GMAT assassins aren't born, they're made,
Rich
_________________
Contact Rich at: Rich.C@empowergmat.com
Image


The Course Used By GMAT Club Moderators To Earn 750+

souvik101990 Score: 760 Q50 V42 ★★★★★
ENGRTOMBA2018 Score: 750 Q49 V44 ★★★★★
Manager
Manager
User avatar
B
Joined: 17 Jun 2015
Posts: 195
GMAT 1: 540 Q39 V26
GMAT 2: 680 Q46 V37
GMAT ToolKit User
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 29 Dec 2015, 13:49
2
EMPOWERgmatRichC wrote:
Hi hdwnkr,

Excellent use of TESTing THE ANSWERS! While that approach isn't nearly as useful overall as TESTing VALUES or the frequent 'math' approaches that will always be an option, it WILL be applicable at least a handful of times on Test Day. Having that approach in your skill-set will help you to quickly (and correctly) solve those few questions and move on with confidence.

GMAT assassins aren't born, they're made,
Rich


Thanks a lot for the encouragement. Much appreciated! :) Helps when I am just days away from the D Day
_________________
Fais de ta vie un rêve et d'un rêve une réalité
Intern
Intern
User avatar
B
Joined: 03 Oct 2016
Posts: 3
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 27 Oct 2016, 00:08
nookway wrote:
The correct answer is D.

A set of 15 different integers has median of 25 and a range of 25. What is greatest possible integer that could be in this set?

Given 15 different integers, lets say

n1, n2, n3, n4, n5, n6, n7, n8, n9, n10, n11, n12, n13, n14, n15

Also given median is 25 i.e. n8 = 25

n1, n2, n3, n4, n5, n6, n7, 25, n9, n10, n11, n12, n13, n14, n15

As each integer is different we need to find the maximum values for all those numbers before the median.

the maximum value n7 can have is one less then the median i.e. 24, similarly n6 will be one less than 24 i.e. 23 ... using this process the values for all number before the median would be..

18, 19, 20, 21, 22, 23, 24, 25, n9, n10, n11, n12, n13, n14, n15

Also given the range is 25 i.e. n15 - n1 (18) = 25
The maximum value n15 can have is 25 + n1 (18) = 43


-------------------------------------------------------------------------------------------------------------------------------------

Haven't you made the assumption that the integers in the set are consecutive integers whereas the question does not specify that they are consecutive?
Target Test Prep Representative
User avatar
G
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2815
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 27 Oct 2016, 17:13
bhushangiri wrote:
A set of 15 different integers has median of 25 and a range of 25. What is greatest possible integer that could be in this set?

A. 32
B. 37
C. 40
D. 43
E. 50


We are given that there are 15 different integers in a set with a median of 25 and a range of 25. We must determine the greatest possible integer that could be in the set. To determine this integer, we need to first determine the greatest possible value of the least integer from the set.

Since there are 15 total integers in the set, there are 7 integers before the median and 7 integers after the median if we list them in order. We must also keep in mind that each integer is different. Thus, the first 8 integers including the median are the following:

18, 19, 20, 21, 22, 23, 24, 25

Since the range of this set is 25, the greatest number in this set must be 25 more than the smallest integer in the set, and thus the largest number in the set is 18 + 25 = 43.

Answer: D
_________________

Jeffrey Miller

Head of GMAT Instruction

Jeff@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

EMPOWERgmat Instructor
User avatar
V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 15316
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 27 Oct 2016, 18:37
Hi Mitty,

Since the question asks for the LARGEST POSSIBLE integer that could be in the set of numbers, we have to tailor our work around a certain 'math idea' - since we have a range of 25, to get the largest possible integer, we need the smallest integer in the set to be as big as possible. Working 'backwards' from the median - and keeping in mind that all of the values are distinct - the numbers BELOW the median would have to be consecutive. In that way, we could make the smallest number as big as possible.

GMAT assassins aren't born, they're made,
Rich
_________________
Contact Rich at: Rich.C@empowergmat.com
Image


The Course Used By GMAT Club Moderators To Earn 750+

souvik101990 Score: 760 Q50 V42 ★★★★★
ENGRTOMBA2018 Score: 750 Q49 V44 ★★★★★
GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 12 Sep 2015
Posts: 4019
Location: Canada
Re: Set of 15 different integers  [#permalink]

Show Tags

New post 10 Nov 2016, 21:16
3
Top Contributor
spc11 wrote:
Set of 15 different integers has a median of 25 and a range of 25, what is the greatest possible integer that could be in this set?
A.32
B.37
C. 40
D. 43
E. 50


Let's tackle this one step at a time.

First, we have 15 different integers.
We can let these 15 spaces represent the 15 numbers written in ascending order: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

If the median is 25, we can add this as the middle value: _ _ _ _ _ _ _ 25 _ _ _ _ _ _ _
Notice that 7 of the remaining numbers must be greater than 25 and the other 7 remaining number must be less than 25.

Since, we are told that the range is 25, we know that the greatest number minus the smallest number = 25

Now notice two things:
1) Once we know the value of the smallest number, the value of the greatest number is fixed.
For example, if the smallest number were 10, then the greatest number would have to be 35 in order to have a range of 25
Similarly, if the smallest number were 12, then the greatest number would have to be 37 in order to have a range of 25

2) If we want to maximize the value of the greatest number, we need to maximize the value of the smallest number.

So, how do we maximize the value of the smallest number in the set?
To do this, we must maximize each of the 7 numbers that are less than the median of 25.

Since the 15 numbers are all different, the largest values we can assign to the numbers less than the median of 25 are as follows:
18 19 20 21 22 23 24 25 _ _ _ _ _ _ _ (this maximizes the value of the smallest number)

If 18 is the maximum value we can assign to the smallest number, and if the range of the 15 numbers is 25, then greatest number must equal 43 (since 43 - 18 = 25)

So, the numbers are as follows: 18 19 20 21 22 23 24 25 _ _ _ _ _ _ 43 (the missing numbers don't really matter here)

This means the answer is 43


RELATED VIDEO

_________________
Test confidently with gmatprepnow.com
Image
Veritas Prep GMAT Instructor
User avatar
V
Joined: 16 Oct 2010
Posts: 9705
Location: Pune, India
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 11 Nov 2016, 01:08
2
bhushangiri wrote:
A set of 15 different integers has median of 25 and a range of 25. What is greatest possible integer that could be in this set?

A. 32
B. 37
C. 40
D. 43
E. 50


The constraints are median (which is easy to handle - just that the 8th integer will be 25) and range (which is 25). The important thing is that all integers are different. For the range to be constant and then have the greatest possible integer, the smallest integer should be as large as possible.

Since all integers are distinct, the smallest integer should be 7 less than 25 i.e. 18 (so 18, 19, 20, 21, 22, 23, 24, 25 are the first 8 integers)

For the range to be 25, the greatest integer should be 18+25 = 43

Answer (D)
_________________
Karishma
Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >
Manager
Manager
avatar
B
Joined: 06 Dec 2016
Posts: 231
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 16 Apr 2017, 15:15
I think the easiest way to approach this problem is process elimination
Let's look at answer D which is 43
25 is the 8th number in the sequence

43 - x = 25
x = 43 - 25
x = 18

18, 19, 20, 21, 22, 23, 24, 25

Therefore, the answer is D
Intern
Intern
avatar
B
Joined: 06 Oct 2017
Posts: 10
GMAT ToolKit User
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 25 Nov 2017, 02:17
matthewsmith_89 wrote:
I think the easiest way to approach this problem is process elimination
Let's look at answer D which is 43
25 is the 8th number in the sequence

43 - x = 25
x = 43 - 25
x = 18

18, 19, 20, 21, 22, 23, 24, 25

Therefore, the answer is D

Hi,

I have a question here, it is mentioned that the median is 25 or we can say the 8th element is 25 and the range is 25 but it's nowhere mentioned that the numbers are consecutive. Then how did you assume them to be consecutive integers?

If I take 37 as the greatest number, then the first element must be 12 and it can still satisfy 12,15,17,19,21,23,24,25

25 can be the median in this case too..or is it a strict rule to assume the numbers in consecutive order? Please explain

As per my knowledge, for the range to be constant, and to find the greatest integer, the smallest integer must be as large as possible.. Here 18 can be the largest..so we have to take 43..
EMPOWERgmat Instructor
User avatar
V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 15316
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 25 Nov 2017, 15:22
1
Hi Pratyaksh2791,

This question asks us to find the greatest possible number that could be in this set. Since 25 is the MEDIAN of the group of 15 INTEGERS, we know that 7 integers are greater than 25 and 7 integers are less than 25. We're told that the largest integer is exactly 25 more than the smallest integer, so to maximize the biggest value, we also have to maximize the smallest value. Since we're restricted to INTEGERS, the only way to get that maximum result is if the 7 integers that are less than 25 are CONSECUTIVE integers:

24, 23, 22, 21, 20, 19 and 18

GMAT assassins aren't born, they're made,
Rich
_________________
Contact Rich at: Rich.C@empowergmat.com
Image


The Course Used By GMAT Club Moderators To Earn 750+

souvik101990 Score: 760 Q50 V42 ★★★★★
ENGRTOMBA2018 Score: 750 Q49 V44 ★★★★★
Manager
Manager
avatar
S
Joined: 24 Sep 2011
Posts: 94
GMAT ToolKit User Reviews Badge
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 19 Jan 2018, 15:39
So does that mean that this set does not contain any -ve integers? I am assuming it can not but why?
_________________
1. Well Begun is Half done
2. He who asks a question is a fool for five minutes; he who does not ask a question remains a fool forever.
3. The night is darkest just before the dawn
EMPOWERgmat Instructor
User avatar
V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 15316
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: A set of 15 different integers has median of 25 and a range  [#permalink]

Show Tags

New post 19 Jan 2018, 20:22
Hi Rocket7,

The question tells us that the RANGE of the numbers is 25... and asks us to find the largest POSSIBLE integer that could be in the set. If you look at the five answer choices - and then subtract 25 from each, you'll see that the SMALLEST number that would correspond to each of those answers would be a positive integer. Thus, the set CANNOT contain any negative numbers.

GMAT assassins aren't born, they're made,
Rich
_________________
Contact Rich at: Rich.C@empowergmat.com
Image


The Course Used By GMAT Club Moderators To Earn 750+

souvik101990 Score: 760 Q50 V42 ★★★★★
ENGRTOMBA2018 Score: 750 Q49 V44 ★★★★★
GMAT Club Bot
Re: A set of 15 different integers has median of 25 and a range   [#permalink] 19 Jan 2018, 20:22

Go to page    1   2    Next  [ 24 posts ] 

Display posts from previous: Sort by

A set of 15 different integers has median of 25 and a range

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





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