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How Old am I?

Solution Step 0/0
When my father was 31 I was 8. Now he is twice as old as I am. How old am I?

Explanations

The difference in age is still 23 years, so I must be 23 if my father is twice as old.

[After Boris A. Kordemsky. The Moscow Puzzles: 359 mathematical recreations. 1972]
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