Thanks. I was surprised to be downvoted, but decided not to ask why.
I downvoted you because you're either completely missing the point of the quote, or you're unsuccessfully trying to be funny.
In case it's not the latter: Yes, since you already know the answer, it's easy to "infer" the result from the givens. But the question is, what additional information are you using that constrains your answer to that? That's what you need to say to solve it, not just repeat back from the answer key.
Furthermore, it's not at all clear that children get the result you claim.
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.