 <translate> 2 / 3 of the birds are chickens because 1 - (1 / 3) = 2 / 3. He has 10 chickens because 15 x (2 / 3) = 10. It will cost $20 to feed them because 10 x 2 = 20. The answer: 20. <yor> Ìdá méjì nínú mẹ́ta àwọn ẹyẹ náà ni adìyẹ nítorí pé 1 - (1 / 3) = 2 / 3. Ó ní adìyẹ mẹ́wàá nítorí pé 15 x (2/3) = 10. Owó tóo máa ná láti fún wọn lóúnjẹ yóò jẹ́ $20 nítorí pé 10 x 2 = 20. Ìdáhùn náà ni: Ọgbọ̀n. 