 
<translate> Tambaya: A da B tare za su iya kammala aiki a cikin kwanaki 12. A kaɗai zai iya kammala shi cikin kwanaki 20. Idan B ya yi aikin na rabin rana ne kawai a kullum, to kwana nawa ne A da B za su gama aikin tare? Zaɓuɓɓuka: (A) 22 (B) 88 (C) goma sha biyar (D) 66 (E) 81 Gudun hankali: Aikin rana guda na B = (1/12 - 1/20) = 1/30 Yanzu, (A + B) aiki na kwana 1 = (1/20 + 1/60) = 1/15 Don haka, A da B tare zasu kammala aikin a cikin kwanaki 15. <eng> 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. 