Set an amount and a three-term ratio. The walkthrough finds the total parts and the master key, multiplies out the shares with a sum check, answers the difference and sum questions in parts, does the percentage comparisons without using the money at all, and finishes by removing the middle person to show the master key move.
₹10,500 among A, B, C in 5 : 7 : 9
21 parts · ₹500 a part · C − A = ₹2,000
Try ₹11,700 in 6 : 4 : 3 — that is the ratio 1/2 : 1/3 : 1/4 after clearing the denominators, and it is the most commonly set version of this model.