 
 <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. <ibo> Ajụjụ: A na B nwere ike ịrụcha ọrụ ahụ n'ụbọchị iri na abụọ. Naanị A pụrụ ịrụcha ya n'ime ụbọchị 20. Ọ bụrụ na B na-arụ ọrụ ahụ naanị ọkara ụbọchị kwa ụbọchị, ụbọchị ole ka A na B ga-arụcha ọrụ ahụ? Nhọrọ: (A) 22 (B) 88 (C) 15 (D) 66 (E) 81 Mgbasa echiche: Ọrụ B rụrụ n'otu ụbọchị = (1/12 - 1/20) = 1/30 Ugbu a, (A + B) 1 ụbọchị ọrụ = (1/20 + 1/60) = 1/15 Ya mere, A na B ga-arụcha ọrụ ahụ n'ime ụbọchị iri na ise. 