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Option 4 : Pen
Let the Zen’s age be x years.
So, Pen’s age = x + 6
Sen’s age = x + 6 - 7 = x - 1
Ben’s age = x - 1 + 2 = x + 1
Ken’s age = x + 1 - 5 = x - 4
→ x - 4 < x - 1 < x < x + 1 < x + 6
→ Ken < Sen < Zen < Ben < Pen
Hence, Pen is the eldest of all.
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