Exercise vs. Puzzle
The same algebra problem twice: stated as bare equations it's a boring exercise, but dressed up as a person's age and their cat's it becomes an intriguing puzzle. (Answer: 15 and 5.)
Transcript
[Exercise] "x is triple y, but x+5 is double y+5." "Lovely. I'm very happy for your numbers."
[Puzzle] "I'm triple my cat's age. But in 5 years, I'll be only double its age." "Well, I say! A mystery of feline chronology!"
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Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-02-21-exercise-vs-puzzle/ (CC BY-NC 4.0)