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MAGIC SQUARE: Calculate A-B+C

The aim is to place the some numbers from the list (7, 8, 10, 11, 14, 16, 17, 25, 27, 28) 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: 20

The first user who solved this task is Djordje Timotijevic.

#brainteasers #math #magicsquare

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She Told Me To Leave

My wife packed my bags and told me to leave.
As I was headed out the door, she said, "I hope you live a long and lonely life!”
I replied, "So now you want me to stay?"

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Biological warfare treaty

In 1972, the first multilateral disarmament treaty to ban an entire category of weapons, the Biological Weapons Convention, was opened for signature. It is an agreement banning biological warfare, by prohibiting development, production and stockpiling of bacteriological (biological) and toxin weapons and by their destruction. Since then, most of the nations of the world have signed or acceded, including ratification on 26 Mar 1975, by the United States, United Kingdom and the Soviet Union. China acceded later (15 Nov 1984). Some ratified it earlier, such as Canada (18 Sep 1972). Israel and several African countries have not joined. Biological weapons are devices which spread disease-causing organisms (such as anthrax, smallpox, plague) or poisons to kill or harm humans, animals or plants.«

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