Answer:
150
Explanation:
Captured was 60
A month later he captures additional 40 making it 100.
In total it is 60 +100=160
And he finds 10 has been tagged making 160-10 =150
Final = 150
writing it out can help
60 caught and tagged
100 caught
160 total caught
10 already tagged
160 - 10 =
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