The movie is in the style of No Survivor (Agatha Christie's mystery novel). 4 people are organized by a mysterious person to attend a math party. The result was a trap, and the organizers actually wanted to kill them all.
However, most of the puzzles in the movie, for people like me who like to read reasoning stories and go to reasoning websites, are as simple as memorizing the answer...
The puzzle about how old the child is, the answer is not given in the movie... ...I can't figure it out either...why 9, 2, 2? Why do you have to have twins? Can't 12, 3, 1?
Unreasonable place: Since the old man has prepared an exit to escape, he wants to live. However, if he was not knocked out, how could he escape from the exit in full view? ? Is there a back-up?
7.5 points.
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