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There are three persons out of which the first person is half the age of second and twice the age of third person. If

There are three persons out of which the first person is half the age of second and twice the age of third person. If the average of their ages is 21, find the age of the eldest person. 1. 9 years 2. 27 years 3. 18 years 36 ears 5. None of these 4.

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