Calculate the number 905
[6083] Calculate the number 905 - NUMBERMANIA: Calculate the number 905 using numbers [7, 2, 4, 3, 46, 820] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 12 - The first user who solved this task is Nílton Corrêa de Sousa
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Calculate the number 905

NUMBERMANIA: Calculate the number 905 using numbers [7, 2, 4, 3, 46, 820] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 12
The first user who solved this task is Nílton Corrêa de Sousa.
#brainteasers #math #numbermania
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Are Blind Pilots Flying?

One day at a busy airport, the passengers on a commercial airliner are seated waiting for the pilot to show up so they can get under way.
The pilot and copilot finally appear in the rear of the plane and begin walking up to the cockpit through the center aisle. Both appear to be blind; the pilot is using a white cane, bumping into passengers right and left as he stumbles down the aisle. The copilot is using a guide dog. Both have their eyes covered with sunglasses.
At first, the passengers do not react thinking that it must be some sort of practical joke. After a few minutes though, the engines start revving, and the airplane begins moving down the runway.
The passengers look at each other with some uneasiness. They start whispering among themselves and look desperately to the stewardesses for reassurance.
Yet, the plane starts accelerating rapidly, and people begin panicking. Some passengers are praying, and as the plane gets closer and closer to the end of the runway, the voices are becoming more and more hysterical.
When the plane has less than twenty feet of runway left, there is a sudden change in the pitch of the shouts as everyone screams at once. At the very last moment, the plane lifts off and is airborne.
Up in the cockpit, the copilot breathes a sigh of relief and tells the pilot: "You know, one of these days the passengers aren't going to scream, and we aren't going to know when to take off!"
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Johannes Robert Rydberg

Born 8 Nov 1854; died 28 Dec 1919 at age 65.Swedish physicist, known for the Rydberg constant in his empirical formula that related the wave numbers of the spectral lines of an element (1890). This formula expressed fundamental relationships in those lines, which he presumed were the result of the inner nature and structure of an element's atoms. In 1897, he suggested that an atomic number for each of the elements, rather than atomic weights, would be a better means for organizing the elements and their periodicity of their characteristics. His work did provided the basis for discovering the electron shell structure of the atom. It was later established that the integer number of positive charges on an element's nucleus (its number of protons) corresponded to his idea of atomic number.«
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