You catch, tag, and release 35 fish back into a pond. Then, you catch 70 more fish, 12 of which have tags on them, What is the best estimate of the number of fish in the pond?
a 100
b 150
c 142
d 204

100

Explanation:

70 + 35 is 105 and if the 12 fish were new it would be 117 which is almost 25 away from 142 but 17 away from 100. hope that makes since!  

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