 
 <translate> If there are 80 fish in total, then there are 80 fish / 2 = 40 blue fish. The orange fish count is 15 less than blue, so it's 40 fish - 15 fish = 25 fish. Olaf has then 80 fish - 25 fish - 40 fish = 15 green fish.
Thus, the answer is 15. <hau> Idan akwai kifi 80 gaba daya, to akwai kifi 80 / 2 = kifi 40 na shudi. Yawan kifin orange ya kasa na blue da 15 saboda haka kifi 40 - kifi 15 = kifi 25. Olaf yana da kifi 80 - kifi 25 - kifi 40 = kifi kore 15. Saboda haka, amsar ita ce 15. 