Last visit was: 08 Aug 2024, 15:45 It is currently 08 Aug 2024, 15:45
Toolkit
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.

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

SORT BY:
Tags:
Show Tags
Hide Tags
Manager
Joined: 15 Jul 2008
Posts: 72
Own Kudos [?]: 410 [362]
Given Kudos: 0
GMAT Club Legend
Joined: 19 Dec 2014
Status:GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Posts: 21835
Own Kudos [?]: 11821 [106]
Given Kudos: 450
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Current Student
Joined: 03 Aug 2006
Posts: 59
Own Kudos [?]: 721 [60]
Given Kudos: 3
General Discussion
Senior Manager
Joined: 14 Aug 2007
Posts: 299
Own Kudos [?]: 595 [11]
Given Kudos: 0
Concentration: MC, PE, VC
Q50  V37
Re: A set of 15 different integers has median of 25 and a range [#permalink]
6
Kudos
5
Bookmarks
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
Joined: 08 May 2009
Status:There is always something new !!
Affiliations: PMI,QAI Global,eXampleCG
Posts: 547
Own Kudos [?]: 597 [9]
Given Kudos: 10
Re: set of 15 integers [#permalink]
6
Kudos
3
Bookmarks
8 different numbers from 1st to 8th number gives lowest number = 25-8= 18
hence max number = 18+25 = 43.
Intern
Joined: 11 Aug 2013
Posts: 2
Own Kudos [?]: 4 [3]
Given Kudos: 0
Re: A set of 15 different integers has median of 25 and a range [#permalink]
2
Kudos
1
Bookmarks
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
Joined: 02 Sep 2009
Posts: 94837
Own Kudos [?]: 647981 [8]
Given Kudos: 86892
Re: A set of 15 different integers has median of 25 and a range [#permalink]
4
Kudos
4
Bookmarks
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
Joined: 17 Jun 2015
Posts: 166
Own Kudos [?]: 201 [7]
Given Kudos: 176
GMAT 1: 540 Q39 V26
GMAT 2: 680 Q50 V31
Re: A set of 15 different integers has median of 25 and a range [#permalink]
7
Kudos
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
GMAT Club Legend
Joined: 19 Dec 2014
Status:GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Posts: 21835
Own Kudos [?]: 11821 [1]
Given Kudos: 450
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]
1
Kudos
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
Manager
Joined: 17 Jun 2015
Posts: 166
Own Kudos [?]: 201 [2]
Given Kudos: 176
GMAT 1: 540 Q39 V26
GMAT 2: 680 Q50 V31
Re: A set of 15 different integers has median of 25 and a range [#permalink]
2
Kudos
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
Intern
Joined: 03 Oct 2016
Posts: 1
Own Kudos [?]: 1 [1]
Given Kudos: 175
Re: A set of 15 different integers has median of 25 and a range [#permalink]
1
Kudos
nookway 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?

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
Joined: 04 Mar 2011
Affiliations: Target Test Prep
Posts: 3036
Own Kudos [?]: 6670 [2]
Given Kudos: 1646
Re: A set of 15 different integers has median of 25 and a range [#permalink]
2
Bookmarks
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.

GMAT Club Legend
Joined: 19 Dec 2014
Status:GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Posts: 21835
Own Kudos [?]: 11821 [0]
Given Kudos: 450
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]
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
GMAT Club Legend
Joined: 12 Sep 2015
Posts: 6804
Own Kudos [?]: 30981 [3]
Given Kudos: 799
Re: Set of 15 different integers [#permalink]
3
Kudos
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
Tutor
Joined: 16 Oct 2010
Posts: 15209
Own Kudos [?]: 67217 [3]
Given Kudos: 437
Location: Pune, India
Re: A set of 15 different integers has median of 25 and a range [#permalink]
2
Kudos
1
Bookmarks
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

Intern
Joined: 06 Oct 2017
Posts: 8
Own Kudos [?]: 10 [0]
Given Kudos: 6
Re: A set of 15 different integers has median of 25 and a range [#permalink]
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

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..
GMAT Club Legend
Joined: 19 Dec 2014
Status:GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Posts: 21835
Own Kudos [?]: 11821 [1]
Given Kudos: 450
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]
1
Kudos
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
Manager
Joined: 24 Sep 2011
Posts: 82
Own Kudos [?]: 87 [0]
Given Kudos: 47
Re: A set of 15 different integers has median of 25 and a range [#permalink]
So does that mean that this set does not contain any -ve integers? I am assuming it can not but why?
GMAT Club Legend
Joined: 19 Dec 2014
Status:GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Posts: 21835
Own Kudos [?]: 11821 [0]
Given Kudos: 450
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]
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
Tutor
Joined: 16 Oct 2010
Posts: 15209
Own Kudos [?]: 67217 [0]
Given Kudos: 437
Location: Pune, India
Re: A set of 15 different integers has median of 25 and a range [#permalink]