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MAGIC SQUARE: Calculate A+B-C

The aim is to place the some numbers from the list (24, 25, 26, 27, 31, 32, 51, 72, 74, 79) 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: 1

#brainteasers #math #magicsquare

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Missing Taxi Driver

Magistrate: "What was he doing when you arrested him?"
Policeman: "He was arguing with a taxi driver, Your Honor."
Magistrate: "That is no proof he was drunk."
Policeman: "Well, Your Honor, there was no taxi driver there."

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Friction match patent

In 1836, Alonzo Dwight Phillips of Springfield, Massachusetts, received the first U.S. patent for the phosphorous friction safety match (No. 68). The first friction matches, using a mixture of chemicals for their heads, were made and sold in England in 1827. Phillips' match, which could be struck on any rough surface, was the first genuine friction match made in America. Known as “loco focos,” and later as “lucifers,” these matches were made entirely by hand from a mixture of chalk, phosphorus, glue and brimstone (sulphur). The introduction of gas for lighting and cooking, and the spread of cigar smoking, made the lucifer almost a necessity. By the time of the Civil War, about a million matches a day were being manufactured.

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