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The caterpillar and the lizard

The caterpillar thinks that both she and the lizard are crazy. If what the sane believes is always true and what the madman believes is always false, is the lizard sane or crazy? Solution The caterpillar cannot be sane because it thinks it is crazy and the ropes do not lie. Therefore she is crazy and if the lizard were too, the caterpillar would think what is true, which contradicts the definition of madmen who always believe what is false.
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How do we cross the river?

To cross this river 6 meters wide, these two hikers only have two boards of 5 meters each. How can they pass without getting wet? Solution A board with 3 meters of its length is placed on land and the other two on the river (like a trampoline on the water). One of the hikers is located at the end of the plank that is on the mainland as a counterweight.
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50 phrases of John D. Rockefeller

John D. Rockefeller (1839 - 1937) was an important American industrialist, businessman and executive director. When he was 14, his family moved from New York, in fact, luck caused them to lose the train from Cleveland to New York, on December 18, 1867, for a few minutes: those that took the coachman who took him to the station in cleaning one of the horseshoes of his horse.
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The price of the bartofón

I have an invoice that tells me that eight astrodeniums, a bartofón, three cartunes and three dosefríos were bought for my company a month and a half ago and we were charged a total of 350 euros. Just one month ago, we have another invoice from the same supplier worth 250 euros for buying five astrodennes, two bartofones, two cartunes and a dosefrio.
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The three fastest horses

At the county fair a vendor has 25 horses for sale. He assures us that everyone is very fast and that none runs at the same speed as the others. We want to buy three horses to participate in the races of the racecourse and the seller allows us to run them in races of a maximum of 5 horses each to find the fastest.
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The Pareto Principle, the 80/20 rule

The Pareto Principle, also known as the 80/20 rule, is a theory that 80% of the consequences of a situation or system are determined by 20% of the causes. Content 1 What does the Pareto Principle establish? 2 Origin of the Pareto Principle 3 Applications of the Pareto Principle 4 Usefulness of the Pareto Principle in Mental Health What does the Pareto Principle establish?
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