BRAIN TEASERS
The Most Difficult Tasks (page 196)

The Most Difficult Tasks (page 196)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 1951 to 1960.
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Calculate the number 2815

NUMBERMANIA: Calculate the number 2815 using numbers [1, 4, 4, 1, 27, 203] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 11
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania
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Calculate the number 775

NUMBERMANIA: Calculate the number 775 using numbers [8, 2, 1, 1, 82, 355] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 11
The first user who solved this task is Nílton Corrêa de Sousa.
CHECK ANSWER
#brainteasers #math #numbermania
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MAGIC SQUARE: Calculate A+B*C

The aim is to place the some numbers from the list (12, 13, 19, 20, 21, 27, 31, 32, 38, 61) 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: 11
The first user who solved this task is Nílton Corrêa de Sousa.
CHECK ANSWER
#brainteasers #math #magicsquare

There was an elderly widow who...

There was an elderly widow who lived in a large mansion. She was feeling generous when it came to Thanksgiving, so she called up the local military base, and asked to speak with the lieutenant.
"Please send up four nice young men to eat dinner here on Thanksgiving, but please, don't send any Jews. Please, no Jews."
The lieutenant replied, "No problem ma'am, and I am sure I speak for the army when I say we all appreciate your kindness."
Well, Thanksgiving rolled around, and the widow went to answer the door when it rang. She was surprised to see four black recruits. "But... But... There must be some mistake," she stammered.
One of them replied, "No ma'am, Lieutenant Goldstein doesn't make mistakes."
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Calculate the number 5238

NUMBERMANIA: Calculate the number 5238 using numbers [8, 6, 8, 4, 86, 289] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 11
The first user who solved this task is Fazil Hashim.
CHECK ANSWER
#brainteasers #math #numbermania
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Calculate the number 6890

NUMBERMANIA: Calculate the number 6890 using numbers [7, 6, 7, 6, 76, 455] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 11
The first user who solved this task is Nílton Corrêa de Sousa.
CHECK ANSWER
#brainteasers #math #numbermania
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Calculate the number 8661

NUMBERMANIA: Calculate the number 8661 using numbers [2, 5, 8, 8, 22, 849] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 11
The first user who solved this task is Nílton Corrêa de Sousa.
CHECK ANSWER
#brainteasers #math #numbermania
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Calculate the number 1033

NUMBERMANIA: Calculate the number 1033 using numbers [2, 8, 5, 9, 71, 992] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 11
The first user who solved this task is Fazil Hashim.
CHECK ANSWER
#brainteasers #math #numbermania
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MAGIC SQUARE: Calculate A+B-C

The aim is to place the some numbers from the list (5, 16, 17, 20, 24, 25, 28, 34, 39, 40, 43, 55) 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: 11
The first user who solved this task is Nasrin 24 T.
CHECK ANSWER
#brainteasers #math #magicsquare
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MAGIC SQUARE: Calculate A-B+C

The aim is to place the some numbers from the list (6, 10, 15, 25, 29, 31, 34, 35, 38, 40, 49, 69) 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: 11
The first user who solved this task is Fazil Hashim.
CHECK ANSWER
#brainteasers #math #magicsquare
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Calculate the number 808

NUMBERMANIA: Calculate the number 808 using numbers [4, 2, 9, 4, 60, 140] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 11
The first user who solved this task is Nílton Corrêa de Sousa.
CHECK ANSWER
#brainteasers #math #numbermania
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Baron Gerard de Geer

Born 2 Oct 1858; died 23 Jul 1943 at age 84.Gerhard (Jakob), Friherre De Geer (Baron) was a Swedish geologist, originator of the varve-counting method used in geochronology. A varve is a seasonal coarse-fine layer of clay deposited in still water.The layers were produced by the annual melt-water sequence with rapid melting and discharge in summer depositing coarse sediments, versus slow settling of fine-grained material during the winter months. The method he devised of counting of layers in glaciers was good for dating back to 18,000 years. Although only accurate to that time, it was useful for studies of the Ice Age.Image: In 1920 De Geer visited the United States to study the varves of New England; he is shown sampling varves at the Essex locality.
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