Four years ago, the average age of A ...

Four years ago, the average age of `A` and `B` was 18 years. At present the average age of `A ,\ B` and `C` is 24 years. What would be the age of `C` after 8 years? (a) 25 years (b) 28 years (c) 32 years (d) 36 years

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