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12 years ago from now, let ages of ‘R’ and ‘L’ be ‘3x’ years and ‘5x’ years, respectively. So, 5x – 3x = 12 Or, 2x = 12 Or, x = 6 Present age of ‘L’ = 5x + 8 = 5 × 6 + 8 = 38 years Age of ‘L’, four years hence from now = 38 + 4 = 42 years