To find the ratio A:B:C, we can equate each term to a common variable and solve for A,B, and C . Calculations: Let 7A=6B=12C=k Then, A=k∕7 B=k∕6 C=k∕12 A:B:C=k∕7:k∕6:k∕12 To remove the fractions, multiply each term by the LCM of the denominators (7,6,12), which is 84. A:B:C=(k∕7)×84:(k∕6)×84:(k∕12)×84 A:B:C=12k:14k:7k Since ' k ' is common, we can eliminate it. A:B:C=12:14:7