 <translate> Question: A and B together can complete a work in 12 days. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work?
Options:
(A) 22
(B) 88
(C) 15
(D) 66
(E) 81
Stream-of-consciousness: B's 1 day work = (1/12 - 1/20) = 1/30
Now, (A + B)'s 1 day work = (1/20 + 1/60) = 1/15
So, A and B together will complete the work in 15 days. <yor> Ìbéèrè: Ṣé A àti B lè ṣe iṣẹ́ kan láàárín ọjọ́ méjìlá? A nìkan lè parí rẹ̀ láàárín ogún ọjọ́. Tó bá jẹ́ pé ààbọ̀ ọjọ́ péré ni B fi ń ṣe iṣẹ́ náà lójoojúmọ́, ọjọ́ mélòó ni A àti B á fi ṣe iṣẹ́ náà pa pọ̀? Àwọn àyè: (A) 22 (B) 88 (C) 15 (D) 66 (E) 81 Ìṣàn Èrò: Iṣẹ́ tí B ṣe lọ́jọ́ kan = (1/12 - 1/20) = 1/30 Ní báyìí, iṣẹ́ ọjọ́ kan ti (A + B) = (1/20 + 1/60) = 1/15 Nítorí náà, A àti B papọ̀ yóò parí iṣẹ́ náà ní ọjọ́ mẹ́ẹ̀ẹ́dógún. 