'2n' years ago ratio of Amit's age to Inder's age is 5 : 4. 'n' years ago ratio of Inder's age to Satish's age is 9 : 7. Difference between present age of Amit to Satish's present age is 12 years. Find the sum of present ages of all three if ratio of Amit's age to Satish's age after 'n' year will be 13 : 9.

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