Last year, a company's salespersons, A, B, and C recorded sales as follows: A recorded three sevenths

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Last year, a company's salespersons, A, B, and C recorded sales as follows: "A" recorded three sevenths (3/7) of the total, "B" recorded one quarter (1/4) of the total and "C" recorded the rest of the sales. Express, in lowest terms, the sales ratio of A : B : C. 3 : 7 : 4 7 : 4 : 1 3 : 1 : 6 21 : 7 : 28 12 : 7 : 9