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D = 3K; D + 12 + K + 12 = 10K

so 3K + 12 + K + 12 = 10K

so 24 = 6K

Kumar is 4 and Dollah is 12. In 12 years they will be 16 and 24, total 40 which is 10 times Kumar's present age. Job done.

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