MAGIC SQUARE: Calculate A*B-C
[4981] MAGIC SQUARE: Calculate A*B-C - The aim is to place the some numbers from the list (1, 3, 5, 7, 10, 12, 16, 21, 25, 30, 54) 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: 16 - 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 (1, 3, 5, 7, 10, 12, 16, 21, 25, 30, 54) 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: 16
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #magicsquare
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First dated printed arithmetic book

In 1478, the anonymous Arte dell'Abbaco(“The Art of the Abacus”), printed in Treviso, Italy had this publication date. It is the first dated printed book on arithmetic. The unknown author was likely a priest, and it was dedicated to some of his young friends who kept asking for it. The printer was probably Geradus de Lisa, dé Flandria. The 124-page text dealt with commercial applications of arithmetic, so the language was the local vernacular Venetian dialect, not the scholarly Latin used for the abstract studies of universities. The book teaches the four main operations, with numerous examples, and the concept of fractions (but not the as yet unknown decimals). He shows how to calculate the date of the new Moon. Although some pamphlets on Algorithmus are possibly older than this book, they are undated.«[Image: detail of a calculation shown in the book.]
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