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MAGIC SQUARE: Calculate A-B-C

The aim is to place the some numbers from the list (4, 5, 6, 9, 10, 11, 14, 16, 17, 20) 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.
Correct answers: 24
The first user who solved this task is Nílton Corrêa De Sousa.
#brainteasers #math #magicsquare
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Biker's Dog

A highly timid little man, ventured into a biker bar in the Bronx and clearing his throat asked, "Um, err, which of you gentlemen owns the Doberman tied outside to the parking meter?"
A giant of a man, wearing biker leathers, his body hair growing out through the seams, turned slowly on his stool, looked down at the quivering little man and said, "It's my dog. Why?"
"Well," squeaked the little man, obviously very nervous, "I believe my dog just killed it, sir."
"What?" roared the big man in disbelief. "What in the hell kind of dog do you have?"
"Sir," answered the little man, "it's a little four week old female puppy."
"Bull!" roared the biker, "how could your puppy kill my Doberman?"
"It appears that your dog choked on her, sir."

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Stonehenge

In 1952, Prof. Willard F. Libby determined the age of Stonehenge on Salisbury Plain, England, at about 1848 BC (+/- 275 years) through analysis of the carbon-14 radioisotope in charcoal remains excavated there there. Update of C-14 ceases when plants or animals die, and the proportion in the organic remains steadily declines through radioactive decay. Since the half-life of C-14 is about 5,600 years, measurement of the remaining proportion in dead organic matter, indicates the age of that sample. Astronomer Sir Joseph Norman Lockyer had previously calculated that on Midsummer Day, 1680 BC, the sun rose directly over a special marking notch that can still be seen on the Heel Stone. Libby's measurements support that estimate.«
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