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Here are the answers and walkthrough to Stupid Test Level 17 Question 11 – David is half his father Duncan’s age. In 10 years, David will be three-fifths Duncan’s age. Ten years ago, David was one-third Duncan’s age. How old are David and Duncan now?
Hint
- Work backwards. David is 20 and Duncan is 40.
Answer
- 20 AND 40
If you need help with all levels of Stupid Test puzzles check our Stupid Test Walkthrough and Answers page.