Last visit was: 19 Nov 2025, 08:19 It is currently 19 Nov 2025, 08:19
Home
GMAT
Messages
Tests
Schools
Events
Rewards
Chat
My Profile
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
   1   2   3   4   5   6   7   8   9   10   
555-605 Level|   Word Problems|         
User avatar
iamchinu97
User avatar
Joined: 14 Dec 2020
Last visit: 19 Nov 2025
Posts: 133
Own Kudos:
139
 [1]
Given Kudos: 34
Products:
My Reviews GMAT Club Tests
Posts: 133
Kudos: 139
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:05
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Dominant. Subordinate Total
Session 1: 5 3 8
Session 2: 3 5 8
Total 8 8 16

Ans Option D
User avatar
Benedictng
User avatar
Joined: 21 Jan 2025
Last visit: 10 Jul 2025
Posts: 18
Own Kudos:
12
 [1]
Given Kudos: 1
Posts: 18
Kudos: 12
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:06
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
At a wildlife reserve, two tracking sessions were conducted to study 16 tagged animals. In each session, the animals were randomly grouped into 8 pairs, and in each pair, one animal was observed as dominant and the other as subordinate. Of the animals that were subordinate in the first session, 5 were also subordinate in the second session. How many animals were dominant in both sessions?

(A) 2
(B) 3
(C) 4
(D) 5
(E) 6


 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 

Show more
    • Total animals: 16
    • Session 1: 8 D, 8 S
    • Session 2: 8 D, 8 S
  2. Number of animals subordinate in Session 1 and dominant in Session 2 = 8 - 5 = 3.
  3. Number of animals dominant in Session 1 and dominant in Session 2 = 8 - 3 = 5 .
User avatar
HarshaBujji
User avatar
Joined: 29 Jun 2020
Last visit: 16 Nov 2025
Posts: 695
Own Kudos:
885
 [1]
Given Kudos: 247
Location: India
Products:
My Reviews
Posts: 695
Kudos: 885
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:06
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
At a wildlife reserve, two tracking sessions were conducted to study 16 tagged animals. In each session, the animals were randomly grouped into 8 pairs, and in each pair, one animal was observed as dominant and the other as subordinate. Of the animals that were subordinate in the first session, 5 were also subordinate in the second session. How many animals were dominant in both sessions?

(A) 2
(B) 3
(C) 4
(D) 5
(E) 6


 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 

Show more

Let us assume that T1,T2 are the sessions:

Session T1: Lets consider the dominant 8 to be A,B,C,D,E,F,G,H
Subordinate would be 1,2,3,4,5,6,7,8.

So irrespective of the grouping, the alphabets (A...H) will always be dominant in comparison with the (1,2,..8).

Session T2: It is said that 5 of the subordinates are common. Irrespective of the 5, we can assume 1,...5 are subordinate.
So the other 3 cannot be subordinate, which means these 3 will be dominant. Hence, there will be only 5 that are dominant in both groups.

Hence IMO D
User avatar
DyutiB
User avatar
Joined: 21 Jul 2024
Last visit: 19 Nov 2025
Posts: 25
Own Kudos:
16
 [1]
Given Kudos: 3
Products:
GMAT Club Tests
Posts: 25
Kudos: 16
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:07
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
At a wildlife reserve, two tracking sessions were conducted to study 16 tagged animals. In each session, the animals were randomly grouped into 8 pairs, and in each pair, one animal was observed as dominant and the other as subordinate. Of the animals that were subordinate in the first session, 5 were also subordinate in the second session. How many animals were dominant in both sessions?

1st dominant 1st subordinate Total
2nd dominant 5 3 8
2nd subordinate 3 5 8
Total 8 8 16


So the number of animals dominant in both the animals = 5. Ans (D)
User avatar
Karanjotsingh
User avatar
Joined: 18 Feb 2024
Last visit: 03 Oct 2025
Posts: 139
Own Kudos:
94
Given Kudos: 362
Location: India
Concentration: Finance, Entrepreneurship
Posts: 139
Kudos: 94
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:08
Kudos
Add Kudos
Bookmarks
Bookmark this Post
There were 8 subordinate animals in Session 1. The problem says 5 of them stayed subordinate in Session 2.

This means the other 3 animals from that group (8 - 5 = 3) must have switched to become dominant in Session 2.

We know there are 8 dominant animals in total in Session 2. Since 3 of them came from the subordinate group, the rest must have been dominant in both sessions.

So, 8 (total dominant in S2) - 3 (who switched) = 5.

5 animals were dominant in both sessions.
User avatar
MercedesF1
User avatar
Joined: 31 Jul 2022
Last visit: 18 Nov 2025
Posts: 33
Own Kudos:
24
 [1]
Given Kudos: 503
Products:
GMAT Club Tests
Posts: 33
Kudos: 24
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:09
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
8 get the dominant tag
8 get the subordinate tag
Of those 8 subordinate, 5 stay subordinate in Session 2.
That means 3 of them switch and become dominant next time.

So 5 animals keep the dominant tag in both sessions.
User avatar
Rahul_Sharma23
User avatar
Joined: 05 Aug 2023
Last visit: 12 Nov 2025
Posts: 114
Own Kudos:
82
 [1]
Given Kudos: 17
Location: India
Schools: Haas '27 Fuqua '27 Darden '27 ISB '27 (S) McCombs '27 HEC Yale '27 Rotman '27
GMAT Focus 1: 695 Q87 V83 DI83
GPA: 2.5
Products:
My Reviews
Schools: Haas '27 Fuqua '27 Darden '27 ISB '27 (S) McCombs '27 HEC Yale '27 Rotman '27
GMAT Focus 1: 695 Q87 V83 DI83
Posts: 114
Kudos: 82
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:11
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
In first session by combining both the pairs 8 Dominant and 8 Subordinates animals wer there. In the second session again there will be a 8 Dominant and 8 Subordinates , and out of these 8 Subordinates, 5 were Subordinates in the earlier session, which means 3 of the earlier Subordinates are now Dominant. Therefore, animals who were Dominant in both sessions are 5.
Bunuel
At a wildlife reserve, two tracking sessions were conducted to study 16 tagged animals. In each session, the animals were randomly grouped into 8 pairs, and in each pair, one animal was observed as dominant and the other as subordinate. Of the animals that were subordinate in the first session, 5 were also subordinate in the second session. How many animals were dominant in both sessions?

(A) 2
(B) 3
(C) 4
(D) 5
(E) 6


 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 

Show more
User avatar
plpurva
User avatar
Joined: 12 Nov 2024
Last visit: 15 Nov 2025
Posts: 19
Own Kudos:
9
 [1]
Given Kudos: 31
Location: India
Schools: ISB Carlson '26 CBS '26
GPA: 6.2
WE:Analyst (Consulting)
Schools: ISB Carlson '26 CBS '26
Posts: 19
Kudos: 9
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:14
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Since each animal appears in at most one morning and one afternoon session, and each session has a maximum of 2 animals, the best-case overlap happens when each animal is placed in one morning and one afternoon session without duplication. So the max number of animals that could have been in both is 5.
User avatar
Missinga
User avatar
Joined: 20 Jan 2025
Last visit: 18 Nov 2025
Posts: 393
Own Kudos:
261
 [1]
Given Kudos: 29
Posts: 393
Kudos: 261
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:20
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
At a wildlife reserve, two tracking sessions were conducted to study 16 tagged animals. In each session, the animals were randomly grouped into 8 pairs, and in each pair, one animal was observed as dominant and the other as subordinate. Of the animals that were subordinate in the first session, 5 were also subordinate in the second session. How many animals were dominant in both sessions?

In session one, 8 Dominant and 8 Subordinate
Of the animals that were subordinate in the first session, 5 were also subordinate in the second session. Means 3 animals that were subordinate in first session became dominant in second session. And out of 8 animals that were dominant in first session, 3 became subordinate.
So, 5 animals were dominant in both sessions

Answer: 5
User avatar
suryabanda
User avatar
Joined: 20 Apr 2015
Last visit: 17 Nov 2025
Posts: 4
Own Kudos:
17
 [1]
Given Kudos: 2
Location: India
GPA: 4
Posts: 4
Kudos: 17
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:21
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
We’re told: There are 16 tagged animals.

In each session, animals are randomly grouped into pairs of 8, with one dominant and one subordinate per pair.

So in each session, there are: 8 dominant animals and 8 subordinate animals

We’re told: Of the 8 animals that were subordinate in the first session, 5 were also subordinate in the second session. So the remaining 3 of those 8 became dominant in session 2. So a total of 5 have continued to be dominant and hence the answer is 5 as they are dominant in both the sessions.
User avatar
Mohak01
User avatar
Joined: 05 Sep 2020
Last visit: 19 Nov 2025
Posts: 104
Own Kudos:
64
 [1]
Given Kudos: 70
Location: India
Schools: ISB '26 NUS '26 (A)
GMAT Focus 1: 695 Q83 V87 DI83
GPA: 8
Schools: ISB '26 NUS '26 (A)
GMAT Focus 1: 695 Q83 V87 DI83
Posts: 104
Kudos: 64
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:25
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Since, out of 8 subordinates, 5 were same in the 2nd session, 3 dominants from 1st session would have turned into subordinates in 2nd session. Which leaves us with 5 dominants which were carried forward into 2nd session. and Thus these 5 dominants are common for both group.
User avatar
VagueMap
User avatar
Joined: 28 Jun 2025
Last visit: 02 Jul 2025
Posts: 24
Own Kudos:
17
 [1]
Given Kudos: 2
Posts: 24
Kudos: 17
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:29
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
D. 5

During the second session, since 5 subordinate animals were from the 8 subordinate animals from the first session, remaining 3 have to be from the 8 animals which were dominant during the first session. So the answer will be 8 dominant from the 2nd session - 3 which we deteremined to be subordinate in the first session = 5 animals which were dominant in both the sessions.
User avatar
Navya442001
User avatar
Joined: 26 Jan 2024
Last visit: 17 Nov 2025
Posts: 67
Own Kudos:
72
Given Kudos: 1
Products:
My Reviews
Posts: 67
Kudos: 72
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:31
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Answer: 5 (choice D)

  1. Each session classifies the 16 animals into
    • 8 dominants and 8 subordinates.
  2. Let’s label the animals by their status in session 1:
    • 8 subordinates
    • 8 dominants.
  3. From the problem: of the 8 subordinates in session 1, 5 stayed subordinate in session 2.
    ⇒ The other 3 of those subordinates became dominant in session 2.
  4. Session 2 still has 8 dominants in total. They consist of
    • 3 animals that switched from subordinate to dominant (step 3)
    • x animals that were already dominant in session 1 and stayed dominant.
  5. So 3 + x = 8 ⇒ x = 5.
Therefore, 5 animals were dominant in both tracking sessions.
User avatar
campbellgarrison9
User avatar
Joined: 29 Nov 2024
Last visit: 04 Nov 2025
Posts: 9
Own Kudos:
8
 [1]
Given Kudos: 100
Location: United States (NC)
Concentration: Finance, Operations
Schools: Columbia '27 McDonough '27 Johnson '27 Stern '27 Wharton '27
GMAT Focus 1: 655 Q85 V84 DI79
GPA: 3.1
Schools: Columbia '27 McDonough '27 Johnson '27 Stern '27 Wharton '27
GMAT Focus 1: 655 Q85 V84 DI79
Posts: 9
Kudos: 8
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:31
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
In the first session we know that 8 would have been subordinate and 8 would have been dominate. If in the second session, 5 of the 8 initial subordinate animals continued to be subordinate... then that means we would have to make up the difference of 3 to get to 8 total subordinate animals in the second session.

If we need 3 NEW subordinate animals to complete our 8, that means we have to remove 3 dominant animals from our initial 8 in the first session. This leaves 5 animals that were dominant in BOTH sessions.

The answer is D
Bunuel
At a wildlife reserve, two tracking sessions were conducted to study 16 tagged animals. In each session, the animals were randomly grouped into 8 pairs, and in each pair, one animal was observed as dominant and the other as subordinate. Of the animals that were subordinate in the first session, 5 were also subordinate in the second session. How many animals were dominant in both sessions?

(A) 2
(B) 3
(C) 4
(D) 5
(E) 6


 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 

Show more
User avatar
Natansha
User avatar
Joined: 13 Jun 2019
Last visit: 15 Nov 2025
Posts: 150
Own Kudos:
29
 [1]
Given Kudos: 84
Posts: 150
Kudos: 29
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:32
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
In the first session, 8 Dominant, 8 Subordinate
In the 2nd session, 8 Dominant, 8 Subordinate
8 Subordinate here includes 5 which were subordinate earlier, then remaining 3 would have been dominant earlier.
8 will include 5 which were also dominant earlier, hence ans 5
User avatar
Imshubhamv
User avatar
Joined: 10 Aug 2021
Last visit: 09 Nov 2025
Posts: 3
Own Kudos:
3
 [1]
Given Kudos: 11
Location: India
Schools: LBS '26
Schools: LBS '26
Posts: 3
Kudos: 3
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:32
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
It's given that 5 animals were Subordinate in 2nd Session, that means, 3 Animals that were Dominant in Session 1 are Subordinate in Session 2.
Similarly, when you create a 2/2 Table, you will see that animals eligible to be Dominant in Session two are:-
- 3 Subordinate Animals from Session 1 & 5 Dominant from Session 1

Which clearly tells us that 5 animals are in dominant in both the sessions.

Session 1 / Session 2DominantSubordinateTotal
Dominant538
Subordinate358
Total8816

  • 5 - Given (Subordinate Animals in both Sessions)



Bunuel
At a wildlife reserve, two tracking sessions were conducted to study 16 tagged animals. In each session, the animals were randomly grouped into 8 pairs, and in each pair, one animal was observed as dominant and the other as subordinate. Of the animals that were subordinate in the first session, 5 were also subordinate in the second session. How many animals were dominant in both sessions?

(A) 2
(B) 3
(C) 4
(D) 5
(E) 6


 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 

Show more
User avatar
sreehere
User avatar
ISB School Moderator
Joined: 04 Mar 2024
Last visit: 10 Nov 2025
Posts: 174
Own Kudos:
112
 [1]
Given Kudos: 73
Location: India
Schools: Duke '26 UNC '26 LBS '26 Tepper '26 McCombs '26
GMAT Focus 1: 625 Q81 V82 DI80
GPA: 7.52
Schools: Duke '26 UNC '26 LBS '26 Tepper '26 McCombs '26
GMAT Focus 1: 625 Q81 V82 DI80
Posts: 174
Kudos: 112
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:40
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
S1 = Subordinate animals in session 1
S2 = Subordinate animals in session 2
D1 = Dominant animals in session 1
D2 = Dominant animals in session 2

S1 = S2 = D1 = D2 = 8 because there were 8 pairs and in each pair, one animal was observed as dominant and the other as subordinate.

S1D1Total
S25 (given)38
D235 (to be calculated)8
Total8816

Answer: (D) 5
User avatar
haianh
User avatar
Joined: 29 Oct 2020
Last visit: 19 Nov 2025
Posts: 41
Own Kudos:
25
 [1]
Given Kudos: 76
Products:
GMAT Club Tests
Posts: 41
Kudos: 25
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:41
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Subordinate (S), Dominant (D)
Session 1 (ss1), Session 2 (ss2)

Given information
S ss1D ss1Total
S ss2538
D ss2358
Total8816

Answer: D
User avatar
mitalijain11
User avatar
Joined: 03 May 2025
Last visit: 14 Nov 2025
Posts: 2
Given Kudos: 1
Posts: 2
Kudos: 0
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:42
Kudos
Add Kudos
Bookmarks
Bookmark this Post
since 5 remain subordinates, then 3 of the dominants will be added to complete 8 pairs. Thus, 5 remain as dominants in both sessions.

thus (D) 5 is the right answer in my opinion!
Bunuel
At a wildlife reserve, two tracking sessions were conducted to study 16 tagged animals. In each session, the animals were randomly grouped into 8 pairs, and in each pair, one animal was observed as dominant and the other as subordinate. Of the animals that were subordinate in the first session, 5 were also subordinate in the second session. How many animals were dominant in both sessions?

(A) 2
(B) 3
(C) 4
(D) 5
(E) 6


 


This question was provided by GMAT Club
for the GMAT Club Olympics Competition

Win over $30,000 in prizes such as Courses, Tests, Private Tutoring, and more

 

Show more
User avatar
gill97
User avatar
Joined: 14 Jul 2022
Last visit: 18 Nov 2025
Posts: 6
Own Kudos:
3
 [1]
Given Kudos: 28
Products:
GMAT Club Tests
Posts: 6
Kudos: 3
 [1]
GMAT Club Olympics 2025 (Day 1): At a wildlife reserve, two tracking 30 Jun 2025, 09:43
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
IMO D. 5
Since the 5 animals which were subordinate in session 2 also, the remaining 3 subordinate will be dominant in the session 2. Hence the remaining 5 from session 2 will be the same dominant animals from session 1.
   1   2   3   4   5   6   7   8   9   10   
Moderators:
Bunuel
Math Expert
105389 posts
Krunaal
Tuck School Moderator
805 posts