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  1. 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 ?
    1. 3
    2. 4
    3. 7
    4. 6
Correct Option: D

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


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