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Puzzle #177: Can you solve a conundrum about monkey siblings?

20 July 2022

#177 Monkeying around

Scientists have been studying two rare monkey species in a forest.

In one part of the forest live the Equalis monkeys, which are split 50-50 between males and females. In another part of the forest are the Fraternis monkeys, of which exactly two-thirds are male – the evolutionary aspect of this isn’t yet known.

Both species are monogamous, with families coming in all shapes and sizes. Some parents stop at one offspring, but there are others with 10 or more, so some monkeys have lots of brothers, while others have none at all. The sex of any infant…

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