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Can someone help me understand this maths riddle? (slrpnk.net)

submitted 9 months ago by [email protected] to c/[email protected]

19 comments fedilink hide all child comments

I just read Dr. No by Percival Everett. It contains a maths riddle that I cannot get my head around. I tried searching online but I couldn't find any answers.

Here's the riddle:

There are three sheepherders who come to a bridge controlled by a troll and his two sons. He demands of them thirty sheep before they can pass. Each shepherd cuts out ten sheep from his flock and they give them to the troll. Once they have crossed, the troll decides that he should only have asked for twenty-five. He sends his sons after the men with five sheep. The sons decide to keep one sheep each and give three back to the herders. They do. Now it is the case that each shepherd has paid only nine sheep. Nine times three is twenty-seven. The trolls kept two. Twenty-seven plus two is twenty-nine. Where is the missing sheep?

Can anyone help me understand?

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[–] [email protected] 26 points 9 months ago* (last edited 9 months ago)

30 sheep are given.

Troll has 30 sheep

Troll returns 5, kids keep two, return three

Shepherds have 3 back, kids have two, troll has 25

Shepherds gave 27 sheep (3*9) = 25 (troll) +2 (kids)

The trolls keeping two should subtract not add (in your write up)