 
 <prompt> "Big Dig Mining Company n gba owo ore meta to to: copper, iron, ati nickel. Ni gbogbo awọn iwe won, 10% ni nickel, 60% ni iron, ati awọn miiran ni copper. Won n gba 720 tons ni nickel lọdun. Nígbà kan, owo tons ti copper ti Big Dig Mining Company gba lọdun?"

```yoruba
"Iṣẹ Big Dig Mining Company n gba owo ore meta to to: copper, iron, ati nickel. Ni gbogbo awọn iwe won, 10% ni nickel, 60% ni iron, ati awọn miiran ni copper. Won n gba 720 tons ni nickel lọdun. Nígbà kan, owo tons ti copper ti Big Dig Mining Company gba lọdun?"
``` <response>: ```Fi R jẹ iṣẹlẹ ọrẹ tóbi rẹ.
Ní ìṣẹlẹ Big Dig, 100 - 10 - 60 = 30% jẹ níkẹl.
Tó bá ṣe 720 jẹ 60% ní 100% ní iṣẹlẹ wọn, 720 / R = 60 / 100.
Nítorí náà, Big Dig ní iṣẹlẹ R = 100 * 720 / 60 = 1200 tọns ní ọrẹ lẹhin.
Nígbà tí wọn ti ṣe ní iṣẹlẹ 1200 * 30 / 100 = 360 tọns ní kọ́pọ̀ dúró.

Ìròyìn yoo jẹ 360.``` 