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MAGIC SQUARE: Calculate A*B-C

The aim is to place the some numbers from the list (4, 8, 11, 13, 17, 20, 33, 37, 40, 45) 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: 8

The first user who solved this task is Nasrin 24 T.

#brainteasers #math #magicsquare

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U.S.Patent Office Fire

In 1836, a fire destroyed the U.S. Patent Office. All records of over 10,000 patents issued over 46 years were lost, most forever, and the patent models filed with them. The office shared space in Blodgett's Hotel with the Post Office. The Patent Office occupied the second and third floors above one end, as well as most of the attic of the entire building. The fire started in the basement, where firewood was stored. The fire engine company next door had unserviceable equipment and time was lost. A bucket brigade attempted to extinguish the flames. Another engine arrived too late; the fire had taken hold. Its water supply was insufficient and the fire consumed the building. Little existed in record elsewhere when an effort was made to restore the patents.«

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