Answer:
Step-by-step explanation:
He has 100 tagged carp to begin with.
The next week he captures 85 and 20 of them are tagged.
20/ 85 = 100 / x Cross multiply
20x = 85*100 Combine the right
20x = 8500 Divide by 20
x = 425
This is a nice problem. Thank you for posting.
