Since, 4A = 5B = 7C Therefore, (A/B) = (5/4) And, (B/C) = (7/5) Let 'B' and 'C' be 7x and 5x, respectively Therefore, 'A' = 7x X (5/4) = 8.75x Therefore, B:C:A = 7x:5x:8.75x = 28:20:35 Hence, option a.
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