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The present ages of two persons are 36 and 50 yr, respectively. If after n yr the ratio of their ages will be 3 : 4, then the value of n is?

3
4
7
6

Correct Answer: 6

Explanation:

According to the question,
(36 + n) / (50 + n) = 3/4
⇒ 144 + 4n = 150 + 3n
∴ n = 6

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