the average age of three persons is 52 years. their ages are in the proportion

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the average age of three persons is 52 years. their ages are in the proportion of 1:5:7. what is the age in years of the oldest one among them.

Options:

A . 9 years

B . 12 years

C . 60 years

D . 84 years

Answer: Option B
Explanation :

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