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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, 17, 18, 73, 74, 80, 89) 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

### 10 Vampire Jokes for Halloween

Why didn't anyone want to babysit the little vampire?
A) Because he was a pain in the neck.

What is Dracula's favorite place in New York City?
A) The Vampire State Building

What did the little vampire say when he went to bed?
A) Turn on the dark, I am afraid of the light.

What did the vampire say to his victim?
A) It's been nice gnawing you.

Why do little vampires look forward to school lunches?
A) Because they know they won't get stake.

Who did Dracula take out on a date?
A) His ghoul friend

What do vampires fear the most?
A) Tooth decay

How do you join Dracula's fan club?

What's a vampire's favorite fruit?
A) Nectarines

What's a vampire's favorite animal?
A) A giraffe

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### First stainless steel cast

In 1913, the first true stainless steel was cast in Sheffield, England. It was a steel alloy that contained 0.24% carbon and 12.8% chromium. English metallurgist, Harry Brearley was developing a more erosion-resistant steel for rifle barrels. In order to examine the grain structure of the steel he needed to etch samples with acid before examining them under the microscope. The etching reagents he used were based on nitric acid, and he found that this new steel strongly resisted chemical attack. He then exposed samples to vinegar and other food acids such as lemon juice and found the same result. Brearley realized that this new steel could also revolutionise the cutlery industry.
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