BRAIN TEASERS

# MAGIC SQUARE: Calculate A+B*C

The aim is to place the some numbers from the list (15, 17, 19, 25, 31, 33, 35, 65, 67, 69, 74) 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 Sanja Šabović.
#brainteasers #math #magicsquare

### The mural

Every newspaper in New York sent a reporter and a staff photographer to the office of a local ophthalmologist when it was learned that he recently performed a successful sight- saving operation on the wife of the country's most celebrated mural artist, who, in addition to paying the doctor's usual fee, had gratefully insisted on painting one of his contemporary masterpieces across an entire wall of the doctor's waiting room.

The mural turned out to be an immense multicolored picture of a human eye, in the center of which stood a perfect miniature likeness of the good doctor himself.

While cameras clicked and most of the newsmen crowded around the famous artist for his comments, one cub reporter drew the eye specialist aside and asked:

"Tell me, if you can, Doctor-what was your first reaction on seeing this fantastic artistic achievement covering an entire wall of your office?"

"To tell the truth," the physician replied, "my first thought was, thank goodness I'm not a hemorrhoid specialist!"

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### DNA

In 1967, the first synthesis of biologically active DNA in a test tube was announced at a press conference by Arthur Kornberg who had worked with Mehran Goulian at Stanford and Robert L. Sinsheimer of MIT. Kornberg chose to replicate the relatively simple DNA chain of the Phi X174 virus, which infects bacteria (a bacteriophage). It has a single strand of DNA only about 5500 nucleotide building blocks long, and with about 11 genes, it was easier to purify without breaking it up. Having isolated the Phi X174 DNA, they used the DNA from E. coli, a common bacterium in the human intestine that could copy a DNA template from any organism. The viral DNA template thus copied was found to be able to infect bacteria - it was error-free, active DNA.*
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