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@neha-singh The population increased in 1st year = 100 + 12 = 112 New population = 112 The population increased in 2nd year = 112 × 16% of 112 ...

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@neha-singh12 years after, age of his son = 8+12 = 20 years. 12 years after age ratio of man's father to that of his son = 72 : 20 = 18 : 5

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