 
 <translate> Some question: A can do a piece of work in 20 days. B in 15 days A and C in 12 days. In how many days can A finish the work if he is assisted by B on one day and C on the next, alternately?
Options:
(A) 2 days
(B) 8 days
(C) 6 days
(D) 8 days
(E) 9 days
Some stream of consciousness: <ibo> Ajụjụ ụfọdụ: A nwere ike ịrụ ọrụ n'ime ụbọchị iri abụọ. B na ụbọchị iri na ise A na C na ụbọchị iri na abụọ. Ụbọchị ole ka A ga-eji rụchaa ọrụ ahụ ma ọ bụrụ na B enyere ya aka n'otu ụbọchị, C enyere ya aka n'echi ya, n'otu mgbe ahụ? Nhọrọ: (A) Ụbọchị abụọ (B) Ụbọchị asatọ (C) Ụbọchị isii (D) Ụbọchị asatọ (E) Ụbọchị 9 Mmetụta ụfọdụ: 