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From: Cursitor Doom <cd@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: Another test (your Sunday ruined part 3)
Date: Sun, 17 Nov 2024 17:50:48 +0000
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On Sun, 17 Nov 2024 11:43:26 -0500, "Tom Del Rosso"
<fizzbintuesday@that-google-mail-domain.com> wrote:

>Cursitor Doom wrote:
>> Here's another relatively simple challenge that shouldn't give anyone
>> here too much troube:
>>
>> https://disk.yandex.com/i/gMFHkx6JnfuLnw
>
>27 in my head in 15 seconds.
>
>If you want to find some that are somewhat hard, look at the Mind Your 
>Decisions channel.

Congratulations, Tom: first 100% correct answer.
There seems to be two approaches here:

1) Add up all the weights and divide by two, or
2) Convert the animals into a, b, c, d and use algebra (specifically
simulatious equations) to solve for the unknown.

I've always been fascinated by the workings of the human brain and how
some people are able to answer questions like this in mere seconds
whereas others - in all other regards reasonably intelligent
individuals - cannot answer them at all.