BRAIN TEASERS
The Most Difficult Tasks (page 2)

The Most Difficult Tasks (page 2)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 11 to 20.
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Find number abc

If 6a5c1 + 2751b = 88ab5 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 1076

NUMBERMANIA: Calculate the number 1076 using numbers [2, 6, 4, 8, 30, 426] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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#brainteasers #math #numbermania

Nun of Your Business

While shopping in a food store, two nuns happened to pass by the beer, wine, and liquor section. One asked the other if she would like a beer.
The second nun answered that, indeed, it would be very nice to have one, but that she would feel uncomfortable purchasing it.
The first nun replied that she would handle it without a problem. She picked up a six-pack and took it to the cashier. The cashier was surprised, so the nun said, This is for washing our hair.
Without blinking an eye, the cashier reached under the counter and put a package of pretzel sticks in the bag with the beer.
The curlers are on me.

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MAGIC SQUARE: Calculate A*B+C

The aim is to place the some numbers from the list (8, 11, 18, 23, 26, 33, 36, 39, 45, 46, 68, 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: 0
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#brainteasers #math #magicsquare
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Find number abc

If 2a4bb - 1b7a3 = 106ac find number abc. Multiple solutions may exist.
Correct answers: 0
CHECK ANSWER
#brainteasers #math
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Calculate the number 3127

NUMBERMANIA: Calculate the number 3127 using numbers [8, 4, 3, 9, 94, 579] 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 478ca + acc5c = 789b4 find number abc. Multiple solutions may exist.
Correct answers: 0
CHECK ANSWER
#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: 0
CHECK ANSWER
#brainteasers #mastermind
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Calculate the number 1190

NUMBERMANIA: Calculate the number 1190 using numbers [3, 7, 1, 6, 25, 142] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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 (4, 15, 16, 17, 22, 23, 24, 46, 49, 50, 51, 63, 85) 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
CHECK ANSWER
#brainteasers #math #magicsquare
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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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First AIDS patient

In 1959, a 25-year-old patient, David Carr, an apprentice printer, entered the Royal Manchester Infirmary in England, with unusual symptoms, including purplish skin lesions, fatigue and weight loss. He died 4½ months later for reasons not then understood. His preserved tissue samples were examined in 1990. In a letter to the journal The Lancet, (7 Jul 1990) Gerald Corbitt, director of clinical virology at the hospital, suggested this could be the earliest known AIDS case. In 1995, the journal Nature, reported that the results were anomolous: the putative HIV detected was of a “relatively modern strain.” In the 20 Jan 1996 Lancet, the earlier claim was retracted, accepting the sample had been contaminated. Having had doubts since 1992, Corbitt said he regarded the analysis as no more than a trial of PCR [polymerase chain reaction] on archival material. Belatedly, the report of a possible early AIDS case was clarified.[Image: AIDS virus attacking a blood cell.]
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