MAGIC SQUARE: Calculate A*B-C
[4695] MAGIC SQUARE: Calculate A*B-C - The aim is to place the some numbers from the list (4, 5, 11, 15, 16, 19, 20, 22, 26, 33, 40) 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. - #brainteasers #math #magicsquare - Correct Answers: 20 - The first user who solved this task is Djordje Timotijevic
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MAGIC SQUARE: Calculate A*B-C

The aim is to place the some numbers from the list (4, 5, 11, 15, 16, 19, 20, 22, 26, 33, 40) 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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Roller skate

In 1869, Isaac Hodgson received a U.S. patent No. 88,711 for his “roller-skate,” with a padded shoe attached to the skate frame. The earliest known type, using two large wheels on each skate was invented by a Belgian, Joseph Merlin, in 1759. In England, Robert John Tyers, a Picadilly fruiterer, on 22 Apr 1823 patented his Volitos, an “apparatus to be attached to boots ... for the purpose of travelling or pleasure,” which used five small wheels in a single line. Somewhat similar skates with rollers were used to simulate ice skating in a scene of Meyerbeer's opera Prophète, Paris, 16 Apr 1849.* Another American inventor, James L. Plimpton of New York, had a patent for four-wheeled roller skates from 1863, whose right was affirmed at a trial for infringement, 28 Jan 1876.*
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