BRAIN TEASERS

# MAGIC SQUARE: Calculate A+B+C

The aim is to place the some numbers from the list (3, 4, 8, 10, 20, 21, 25, 71, 72, 76) into the empty squares and squares marked with A, B an C. Sum of each row and column should be equal. All the numbers of the magic square must be different. Find values for A, B, and C. Solution is A+B+C.
The first user who solved this task is Nasrin 24 T.
#brainteasers #math #magicsquare

### A farmer has three sons. One d...

A farmer has three sons. One day, his oldest boy comes to him and pleads with him that he is graduating from school and would really like to get a car. His father says, "Son, come with me." He takes him to the barn and points to the farm tractor and says, "That tractor is needed here on the farm and I promise that as soon as it's paid for, we'll get you a car." The boy was not too happy but he did understand that situation and said, "Okay, Dad."A week later, his second son (10 years old) approaches him wanting a new two-wheel bicycle. Well, he gets the same excuse ... "as soon as that tractor is paid for..."
Shortly, a few days later, son no. 3, his youngest, comes bugging him for a tricycle. Again, 'ol Dad gives him the lecture about the tractor being paid for first.
While leaving the barn, the young boy, more than a little disgusted with the whole thing, sees a rooster mating with one of the hens and promptly goes over and kicks the rooster off the hens back,mumbling to himself the whole time.
His dad says, "Son, why on earth would you do something like that? He didn't do anything to you to deserve that!"
The little boy looks Dad right square in the eye and says,"Hey, nobody rides anything around here until that damn tractor is paid for.
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### Clinton Joseph Davisson

Born 22 Oct 1881; died 1 Feb 1958 at age 76. American physicist who shared the Nobel Prize for Physics in 1937 (with Englishman George P. Thomson) for discovering that electrons can be diffracted like light waves, thus verifying the thesis of Louis de Broglie that electrons behave both as waves and as particles. Davisson studied the effect of electron bombardment on surfaces, and observed (1925) the angle of reflection could depend on crystal orientation. Following Louis de Broglie's theory of the wave nature of particles, he realized that his results could be due to diffraction of electrons by the pattern of atoms on the crystal surface. Davisson worked with Lester Germer in an experiment in which electrons bouncing off a nickel surface produced wave patterns similar to those formed by light reflected from a diffraction grating, and supporting de Broglie's electron wavelength = (h/p). This discovery has been applied to the study of nuclear, atomic, and molecular structure. Davisson helped develop the electron microscope which uses the wave nature of electrons to view details smaller than the wavelength of visible light.
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