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The mean of the ages of father and his son is 27 years. After 18 years, father will be twice as old as…

The two ages add up to \(2\times27=54\). If the son is \(s\), then after 18 years \(f+18 = 2(s+18)\), so \(f = 2s+18\). Substituting into \(f+s=54\) gives \(3s = 36\), so…

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The mean of the ages of father and his son is 27 years. After 18 years, father will be twice as old as his son. Their present ages are

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Correct answer A

The two ages add up to 2×27=542\times27=54. If the son is ss, then after 18 years f+18=2(s+18)f+18 = 2(s+18), so f=2s+18f = 2s+18. Substituting into f+s=54f+s=54 gives 3s=363s = 36, so s=12s=12 and f=42f=42.

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