The average age of a man and his son is 27 yr. The ratio of their ages is 8 : 1, respectively. What will be the son's age after 6 yr?

6 yr
14 yr
12 yr
8 yr

Correct Answer: 12 yr

Explanation:

Let ages of man and his son are 8k yr and k yr, respectively .
According to the question,
(8k + k)/2 = 27
⇒ k = (27 x 2)/9 = 6
Hence, age of son after 6 yr = 6 + 6 = 12 yr

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