If 15 Horses eat 15 bags of gram in 15 days, in how many days will one horse eat one bag of Grain?	Choose the correct choice from the following answers: A) 15 days B) 1 / 15 days C) 1 day D) 30 days E) 225 days

Rationale: horse * days = bags 15 * 15 = 15 and 1 * days = 1 ( 15 * 15 ) / ( 1 * days ) = 15 / 1 days = 15 answer : a
Answer: A