BRAIN TEASERS

Monthly Archive - July 2015 (page 3)

brain teasers, puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 21 to 30.

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Find the right combination

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.

Correct answers: 87

The first user who solved this task is Irena Katic Kuzmanovic.

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Elevator

In 1853, Elisha Graves Otis sold his first safety elevator equipment, having started his business earlier in the year to sell the safety elevator system he had invented the year before. His customer was Benjamin Newhouse in New York City who used it for moving freight. Shortly thereafter, in May 1854, at the Crystal Palace in New York City, Otis created public interest with a daring demonstration. He was hoisted high in the air on a platform fitted with his safety feature. When he called for the rope to be cut, the safety device stopped his fall. By 1857, he installed the first department store passenger elevator at E.V. Haughwout & Co. in New York City. In 1889 he applied the electric motor to power elevators.«

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