BRAIN TEASERS
Brain Teasers

Brain Teasers

puzzles, riddles, mathematical problems, word games, mastermind, cinemania, music, sport... These are the tasks listed 1 to 10.
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Which is a winning combination of digits?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
Correct answers: 3
The first user who solved this task is Nasrin 24 T.
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#brainteasers #mastermind
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Calculate the number 511

NUMBERMANIA: Calculate the number 511 using numbers [4, 1, 3, 7, 78, 597] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 2
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania
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MAGIC SQUARE: Calculate A-B+C

The aim is to place the some numbers from the list (10, 12, 13, 15, 16, 21, 24, 50, 51, 59, 78) 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: 4
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math #magicsquare

Two sisters, one blonde and on...

Two sisters, one blonde and one brunette, inherit the family ranch. Unfortunately, after just a few years, they are in financial trouble. In order to keep the bank from repossessing the ranch, they need to purchase a bull so that they can breed their own stock. The brunette balances their checkbook, then takes their last $600 dollars out west to another ranch where a man has a prize bull for sale.
Upon leaving, she tells her sister, "When I get there, if I decide to buy the bull, I’ll contact you to drive out after me and haul it home."
The brunette arrives at the man’s ranch, inspects the bull, and decides she does want to buy it. The man tells her that he can sell it for $599, no less. After paying him, she drives to the nearest town to send her sister a telegram to tell her the news.
She walks into the telegraph office, and says, "I want to send a telegram to my sister telling her that I’ve bought a bull for our ranch. I need her to hitch the trailer to our pickup truck and drive out here so we can haul it home."
The telegraph operator explains that he’ll be glad to help her, then adds, "It’s just 99 cents a word."
Well, after paying for the bull, the brunette only has $1 left. She realizes that she’ll only be able to send her sister one word.
After thinking for a few minutes, she nods, and says, "I want you to send her the word, ‘comfortable.’"
The telegraph operator shakes his head. "How is she ever going to know that you want her to hitch the trailer to your pickup truck and drive out here to haul that bull back to your ranch if you send her the word, ‘comfortable’?"
The brunette explains, "My sister’s blonde. She’ll read it very slow."
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Find number abc

If cbca3 - a7373 = 38ab0 find number abc. Multiple solutions may exist.
Correct answers: 7
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math
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Find the right combination

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
Correct answers: 9
The first user who solved this task is Nasrin 24 T.
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#brainteasers #mastermind
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Calculate the number 973

NUMBERMANIA: Calculate the number 973 using numbers [7, 6, 8, 2, 89, 183] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 2
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania
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Find number abc

If abc3c - aab60 = a87c find number abc. Multiple solutions may exist.
Correct answers: 13
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math
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What a winning combination?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
Correct answers: 17
The first user who solved this task is Nasrin 24 T.
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#brainteasers #mastermind
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Calculate the number 1618

NUMBERMANIA: Calculate the number 1618 using numbers [7, 2, 9, 5, 14, 704] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 2
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania
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MAGIC SQUARE: Calculate A*B+C

The aim is to place the some numbers from the list (25, 26, 29, 30, 34, 38, 65, 66, 74, 86) 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: 3
The first user who solved this task is Nasrin 24 T.
CHECK ANSWER
#brainteasers #math #magicsquare
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Nora Stanton Blatch Barney

Died 18 Jan 1971 at age 87 (born 30 Sep 1883).American civil engineer whose professional and political activities built on her family's tradition of women leaders. In 1905, she was the first woman in the U.S. to obtain a degree in civil engineering and the first junior member of the American Society of Civil Engineers. Fresh from college, she wrote a paper on the water supply of Washington, DC which was a reference for studies on the transport of solids in liquids for over 50 years. In 1908, she married Lee De Forest, inventor of the radio vacuum tube, for whom she worked as a laboratory assistant until 1909, when they separated (they divorced in 1912). In 1908, on a honeymoon trip to France, De Forest transmitted voice communication from the Eiffel Tower to receivers 500 miles away.
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