Stupid Test Level 17 Question 11


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?


  • Work backwards. David is 20 and Duncan is 40.


  • 20 AND 40

Stupid Test level 17-11

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