MAGIC SQUARE: Calculate A-B+C
[6187] MAGIC SQUARE: Calculate A-B+C - The aim is to place the some numbers from the list (3, 13, 15, 20, 21, 22, 23, 28, 31, 33, 39, 42) 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: 8 - The first user who solved this task is Nasrin 24 T
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MAGIC SQUARE: Calculate A-B+C

The aim is to place the some numbers from the list (3, 13, 15, 20, 21, 22, 23, 28, 31, 33, 39, 42) 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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Getting tough

My grandfather worked in a blacksmith shop when he was a boy, and he used to tell me, when I was a little boy myself, how he had toughened himself up so he could stand the rigors of blacksmithing.

One story was how he had developed his arm and shoulders muscles. He said he would stand outside behind the house and, with a 5-pound potato sack in each hand, he would extend his arms straight out to his sides and hold them there as long as he could.

After awhile, he tried 10-pound potato sacks, then 50-pound potato sacks. Finally, he got to where he could lift a 100-pound potato sack in each hand and hold his arms straight out for more than a full minute!

Next, he started putting potatoes in the sacks.

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Standard time

In 1883, standard time in the U.S. went into effect at noon for the first time due a decision of the American Railway Association. The actual local time, or “sun time” constantly changes as one moves either east or west. With the arrival of railroad travel, the situation raised problems for railway lines and passengers trying to synchronize schedules in different cities. The need for a system of standardized time was evident. The system adopted was first proposed by Charles F. Dowd (1825-1904), a school principal in New York state. North America was divided into four time zones, fifteen degrees of longitude, and one hour of "standard time" apart. Sir Stanford Fleming proposed the extension of the Dowd system to the whole world with 24 time zones.
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