BRAIN TEASERS
The Most Difficult Tasks (page 25)

The Most Difficult Tasks (page 25)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 241 to 250.
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MAGIC SQUARE: Calculate A-B*C

The aim is to place the some numbers from the list (5, 12, 15, 21, 24, 26, 27, 29, 33, 35) 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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MAGIC SQUARE: Calculate A-B+C

The aim is to place the some numbers from the list (5, 6, 11, 19, 20, 25, 26, 27, 28, 32) 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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MAGIC SQUARE: Calculate A*B-C

The aim is to place the some numbers from the list (7, 8, 9, 16, 26, 27, 31, 32, 34, 39, 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: 0
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#brainteasers #math #magicsquare

Polishing Apples

A young man asked an old rich man how he made his money.
The old guy fingered his expensive wool vest and said, "Well, son, it was 1932. The depth of the Great Depression. I was down to my last nickel."
"I invested that nickel in an apple. I spent the entire day polishing the apple and, at the end of the day, I sold the apple for ten cents."
"The next morning, I invested those ten cents in two apples. I spent the entire day polishing them and sold them at 5:00 pm for 20 cents. I continued this system for a month, by the end of which I'd accumulated a fortune of $9.80."
"Then my wife's father died and left us two million dollars."

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MAGIC SQUARE: Calculate A+B*C

The aim is to place the some numbers from the list (12, 13, 14, 18, 19, 22, 27, 57, 58, 66) 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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MAGIC SQUARE: Calculate A*B-C

The aim is to place the some numbers from the list (13, 15, 16, 18, 20, 23, 37, 39, 44, 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: 0
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#brainteasers #math #magicsquare
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Calculate the number 9167

NUMBERMANIA: Calculate the number 9167 using numbers [4, 3, 9, 7, 37, 881] 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 c4bab + 4b5ca = a2aa8c 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
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#brainteasers #mastermind
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Calculate the number 1520

NUMBERMANIA: Calculate the number 1520 using numbers [6, 9, 9, 7, 96, 634] 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 (9, 11, 13, 15, 17, 21, 45, 47, 53, 65, 77) 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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Transcontinental radio telephone

In 1915, a transcontinental radio telephone demonstration was given in New York City. Speech was transmitted via Arlington, Va. to Mare Island at San Francisco, Cal. (2,500 miles). The same night, speech was also transmitted to Honolulu.
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