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# MAGIC SQUARE: Calculate A-B+C

The aim is to place the some numbers from the list (3, 4, 5, 6, 7, 8, 10, 11, 12, 19, 79) 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: 1
#brainteasers #math #magicsquare
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### Parrot wih an attitude...

A young man named John received a parrot as a gift. The parrot had a bad attitude and an even worse vocabulary. Every word out of this bird's mouth was rude, obnoxious and laced with profanity.

John tried and tried to change the bird's attitude by constantly saying polite words, playing soft music, and anything he could think of to set a good example. Nothing worked.

Finally, John got fed up and he yelled at the parrot. And, the bird yelled back. John shook the parrot, and the bird got angrier and ruder. Finally, in a moment of desperation, John put the bird in the refrigerator freezer.

For a few minutes, John heard the bird squawk and kick and scream... then suddenly there was quiet. Not a peep for over a minute. Fearing that he'd hurt the bird, John quickly opened the door to the freezer. The parrot calmly stepped out onto John's outstretched arm and said, "I believe I may have offended you with my rude language and actions. I am truly sorry, and I will do everything to correct my poor behavior."

John was astonished at the bird's change of attitude. As he was about to ask the parrot what had made such a dramatic change in his behavior, the bird continued,

"May I ask what the chicken did?"

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### Rufus Porter

Died 13 Aug 1884 at age 92 (born 1 May 1792). American editor and inventor who put out the first issue of Scientific American on 28 Aug 1845, but sold that business 10 months later to Orson Munn and Alfred Ely Beach. He editted it for one more year. As an inventor, he had little business sense, but held over 100 patents, including a fire alarm, signal telegraph, fog whistle, and a washing machine. He sold his patent for a revolving rifle to Samuel Colt for \$100 in 1844. He had an interest in painting portraits, and in 1820 built a camera obscura. From 1820, he became interested in the hot-air balloon. He constructed his first model in 1833. Porter built and exhibited other models. By 1853, he demonstrated a 22-foot model airship which circled in the rotunda of the New York Merchant's Exchange. Ultimately, despite trying, he had no major success in aerial navigation.«
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