Question

I tried number 7 but didnt get it so i would like for help plz

Answer 1

6f - 5 + 3f = 149.55
9f - 5 = 149.55
5f = 149.55 + 5
9f = 154.55
f = 154.55 / 9
f = 17.172 rounds to $ 17.17 per fish

Answer 2

You were close, but I think you thought that after buying 6 fishes, it would be $5 off. I think that for each fish, it is $5 off, with 6 fishes the maximum.