How old is Jack?

I. After 20 years, Jack will be twice as old as he is today.

II. Five years ago, Jack was ¾ times of his present age.

Let Jack’s current age be x years, From I, x + 20 = 2x x = 20 From II, x – 5 = ¾ x 4x – 20 = 3x x = 20 Thus, either of statements alone is sufficient to answer the given question.

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