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It's a beautiful puzzle because it doesn't actually involve any complex math. Just basic logic, but you do have to be very careful with it.
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since I’m immersed in the system, I’m wringing my hands and thinking why children must be put through such questions that seem to have little relevance to life. but you seem to approve them because of the thinking skills that underpin the solutions
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I don't know if I approve of it as a standardized test question. It's kind of like putting "run a 5 minute mile" on a physical fitness test meant for the general population: quite unfair to most regular people.
But as a competition question I think it's definitely fair.
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Hate to brag but it’s a Singapore question. Maths Olympiad meant for 14/15-year-old teens
And nope, I don’t think I can solve this. Haha. Neither do I really care