Age of ship and boiler

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New Zealand to Tahiti. I was curious to look around the ship one day and in the boiler room I asked a man how old the ship was. He smiled and replied me in this way: ‘The ship is twice as old as its boiler was when the ship was as old as the boiler is now. And the combined age of the ship and the boiler is thirty years.’
Can you figure out what is the age of the ship and of the boiler?

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JamesBond Guru Asked on 26th July 2015 in Interview Puzzles.
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    Let’s assume that the age of the ship at present is X years and of the boiler Y years.
    Then
    The ship X is twice as old as its boiler (Y—X) was when the ship was (x—X) as old as the boiler is now.
    X = 2 (Y—X) and (x—X) 2. Eliminating X gives 4Y = 3x. Also, x+Y = 30
    Y (the boiler) = 90/7years and
    X (the ship)= 120/7 years

    John123 Expert Answered on 26th July 2015.
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