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Puzzle Details

My current age is the age of my favourite book (which is 14 years old) plus one third of my age.

How old will I be when my favourite book is twice its current age?

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Answer: I will be 35 in 14 years.

I am currently 21.

If x is my current age, then:

  x = 14 + x
           -
           3
so

  3x = 42 + x

and

  2x = 42

So

  x = 21

I am currently 21 and my favourite book is currently 14 years old, when it is 28 years old (double its age) I will be 35.

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