Question

1. You catch and tag 100 fish from a lake and release them unharmed. Next day you return and catch 100 fish again, but only 20 of them are tagged. Estimate the the number of fish in the lake.

Answer 1

it would be 500

Answer 2

understood?

Answer 3

thanks for the answer. Could you please explain to me how yo got it so i can better understand?
Thanks again

Answer 4

well its actually a little complicated to explain but ill try :p

Answer 5

the fisherman tagged 100 fish and when he came back he only found 20 out of 100 tagged.

try and look at it as a ratio
therefore we must assume the every time he comes back out of 100 fish caught he will only find 20 tagged

Answer 6

therefore a ratio of 20:100

Answer 7

if we multiply this by 5 we'll get 100: 500

Answer 8

therefore the 100 he initially caught was 1/5th of the population of fish in the lake

Answer 9

which is why when he came back and caught 100 fish again he should get 20 out of every 100 fish tagged

Answer 10

get it?

Answer 11

i do, thanks very much, your the best =)

Answer 12

:)