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Let the present ages of ‘A’ and ‘B’ be 7x years and 6x years, respectively Therefore, 6x + 2 = 20 Or, 6x = 18 Or, x = 3 Sum of present ages of ‘A’ and ‘B’ = 7x + 6x = 39 years Sum of present ages of ‘A’, 'B’ and ‘C’ = 21 × 3 = 63 years Therefore, present age of ‘C’ = 63 – 39 = 24 years
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