'A', 'B' and 'C' started a business such that the sum invested by 'B' is (1/6)th of the total sum invested by all of them together and (1/2) of the sum invested by 'A'. If 'A', 'B' and 'C' invested their sums for 6 months, 3 months and 4 months, respectively, then find the ratio of profits received by 'A', 'B' and 'C' respectively.