BRAIN TEASERS
The Most Difficult Tasks

The Most Difficult Tasks

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 1 to 10.
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Calculate the number 1689

NUMBERMANIA: Calculate the number 1689 using numbers [5, 3, 1, 1, 28, 559] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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#brainteasers #math #numbermania
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Find number abc

If c9b81 + 9baca = 1ca8ab find number abc. Multiple solutions may exist.
Correct answers: 0
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#brainteasers #math
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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: 0
CHECK ANSWER
#brainteasers #mastermind

One evening, a man gave his ti...

One evening, a man gave his tipsy secretary a ride home after an office party. His wife was prone to jealousy, so he didn't mention the incident to her.
Later in the evening, he was driving his wife to a restaurant when he noticed a stiletto-heeled shoe half-hidden under the passenger seat. Gripped with terror, he took advantage of a moment when she wasn't looking to grab the shoe and throw it out of the window.
The rest of the journey went well until they arrived at the restaurant.
"That's strange," said his wife, looking a little agitated. "Have you seen my other shoe?"
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Calculate the number 1346

NUMBERMANIA: Calculate the number 1346 using numbers [1, 3, 8, 5, 91, 479] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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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 (5, 6, 11, 13, 14, 19, 29, 31, 32, 37) 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: 0
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#brainteasers #math #magicsquare
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Find number abc

If c708b - 78aa0 = 1886b find number abc. Multiple solutions may exist.
Correct answers: 0
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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: 0
CHECK ANSWER
#brainteasers #mastermind
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Calculate the number 1421

NUMBERMANIA: Calculate the number 1421 using numbers [9, 4, 1, 2, 74, 383] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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#brainteasers #math #numbermania
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Find number abc

If baacc + 2a311 = 122baa find number abc. Multiple solutions may exist.
Correct answers: 0
CHECK ANSWER
#brainteasers #math
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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: 0
CHECK ANSWER
#brainteasers #mastermind
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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.
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Vacuum cleaner

In 1869, Ives W. McGaffney of Chicago obtained the first American patent for a "sweeping machine" (U.S. No. 91,145). This first suction-type vacuum cleaner was a light hand-powered device for surface cleaning. The mechanism consists of a handle to turn a pulley which uses a belt to drive a fan in a casing, thus producing a strong current of air, "controlled to take up dust and dirt, and carry the fine particles into a porous air-chamber, so constructed as to allow the air to escape while the dust is retained." The air-chamber could be "a bag made of fine and firm cotton, with an elastic band or cord fixed in a hem around its mouth, which is drawn closely over the discharge-opening of the fan." Its top end is suspended on a cross-bar on the handle.
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