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ATQ,
Let the present age of Aman and Dinesh be '2x' years and '3x' years, respectively.
So, present age of Rohan = 5/3 × 3x = 5x years
Rohan's present age = (20 + 4) = 24 years.
So, 5x = 24
Or, x = 24/5
Required sum = (2x + 3x) = (5x) = (5 × 24/5 ) = 24 years
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I. Metal oxides are acidic in nature
II. Non-metallic oxides are basic in nature
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