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A + B = 2 × 22 = 44 yr B + C = 2 × 20 = 40 yr C + A = 2 × 23 = 46 yr On adding all three, 2 (A + B + C) = 44 + 40 + 46 = 130 ⇒ A + B + C = 65 ∴ A = (A + B + C) – (B + C) = 65 – 40 = 25 yr
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