Answer :
The actual number of deer in the forest is the total number of deer in the forest and it is 150 deers
How to estimate the actual number of deer?
The warden captures and tags 60 deer in a forest.
A month later he captures 100 deer and find out 10 of them are already tagged.
This means he had already captured those other deer initially.
Therefore, the second month he actually captured 90 deers.
The actual number of deer in the forest is 90 + 60 = 150 deers
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