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31 Jul 2025, 08:11
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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
A. 2
B. 3
C. 4
D. 5
E. 6
31 Jul 2025, 08:11
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Official Solution:
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
In each session, 16 animals were placed into 8 pairs, so exactly 8 animals were observed as dominant and 8 as subordinate.
In the second session, 8 animals were subordinate. Of those, 5 had already been subordinate in the first session.
That means the other 3 subordinate animals in the second session must have been dominant in the first session.
So, out of the 8 animals that were dominant in the first session, 3 became subordinate in the second, leaving 8 - 3 = 5 animals that were dominant in both sessions.
Answer: D
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
In each session, 16 animals were placed into 8 pairs, so exactly 8 animals were observed as dominant and 8 as subordinate.
In the second session, 8 animals were subordinate. Of those, 5 had already been subordinate in the first session.
That means the other 3 subordinate animals in the second session must have been dominant in the first session.
So, out of the 8 animals that were dominant in the first session, 3 became subordinate in the second, leaving 8 - 3 = 5 animals that were dominant in both sessions.
Answer: D
04 Aug 2025, 02:20
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Bunuel
Why do we have two times ''5'' in the answer choices???
I had 5 as answer and i chose C, but still i got it wrong, while it is the right answer.
Answer choice D is also a 5, how is that possible?
Thanks in advance!
Why do we have two times ''5'' in the answer choices???
I had 5 as answer and i chose C, but still i got it wrong, while it is the right answer.
Answer choice D is also a 5, how is that possible?
Thanks in advance!
