 <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. <yor> Tí ẹja bá jẹ́ ọgọ́rin, 80 ẹja/ẹja méjì = ogójì ẹja aláwọ̀ búlúù Iye ẹja osan jẹ 15 kere ju bulu lọ, nitorinaa o jẹ 40 ẹja - 15 ẹja = 25 ẹja. Olaf ní ẹja 80 - ẹja 25 - ẹja 40 = ẹja alawọ 15. Nítorí náà, ìdáhùn náà ni mẹ́ẹ̀ẹ́dógún. 