 <translate> Give the step-by-step reasoning process and then the final answer. Harry uses a whole bag of chocolate chips when he makes dough for chocolate chip cookies. The dough makes three batches of cookies, and each cookie has nine chocolate chips in it. A bag of chocolate chips has 81 chips in it. How many cookies are in a batch? <yor> Ṣàlàyé bí wọ́n ṣe ń ronú lẹ́ẹ̀kan-lẹ́ẹ̀kan, kó o sì wá sọ ìdáhùn tó o máa fún wọn. Harry máa ń lo odindi àpò ṣokoléètì nígbà tó bá ń ṣe ìyẹ̀fun fún àwọn búrẹ́dì ṣokoléètì. Ìwúkàrà náà á wá di oríṣi búrẹ́dì mẹ́ta, búrẹ́dì kọ̀ọ̀kan á sì ní ṣokoléètì mẹ́sàn-án nínú. Ìgò ṣokoléètì kan ní ṣokoléètì méjìlélọ́gọ́rin nínú. Ìdìpọ̀ mélòó ni búrẹ́dì wà nínú rẹ̀? 