Six years ago, the ages of Sunil and Anil were in the ratio 3 : 5. Four years from now, the ratio will be 5 : 7. What is Sunil's present age? (answer in years)

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21. Six years ago: 3k and 5k. Four years from now they are 3k + 10 and 5k + 10. (3k + 10)/(5k + 10) = 5/7 → 21k + 70 = 25k + 50 → k = 5. Sunil now = 15 + 6 = 21 years.

Six years ago, the ages of Sunil and Anil were in the ratio 3 : 5. Four years from now, the ratio will be 5 : 7. What is Sunil's present age? (answer in years)

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