BRAIN TEASERS
The Most Difficult Tasks (page 17)

The Most Difficult Tasks (page 17)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 161 to 170.
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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
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#brainteasers #mastermind
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Calculate the number 714

NUMBERMANIA: Calculate the number 714 using numbers [5, 3, 7, 6, 27, 116] 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 (12, 13, 14, 15, 22, 24, 43, 44, 53, 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
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#brainteasers #math #magicsquare

The End Is Near

Fred and Luke were fishing on the side of the road. They made a sign saying:

THE END IS NEAR! TURN YOURSELF AROUND
NOW BEFORE IT'S TOO LATE!!

…and showed it to each passing car.

One driver that passed didn't appreciate the sign and shouted out his window, “Leave me alone you nuts!”

All of a sudden they heard a big splash.

Fred turned to Luke, “do you think we should just put up a sign that says: ‘Bridge Out Ahead' instead?”

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Find number abc

If b85c1 - 22581 = 25a2c 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
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Calculate the number 2628

NUMBERMANIA: Calculate the number 2628 using numbers [3, 3, 7, 7, 83, 205] 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 5b21b - ac7cc = 1751b find number abc. Multiple solutions may exist.
Correct answers: 0
CHECK ANSWER
#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 6513

NUMBERMANIA: Calculate the number 6513 using numbers [8, 5, 6, 2, 16, 499] 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 (5, 14, 16, 19, 24, 26, 29, 31, 33, 36, 45) 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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Edward A. Doisy

Born 13 Nov 1893; died 23 Oct 1986 at age 92.Edward Adelbert Doisy was an American biochemist who shared (with Henrik Dam) the 1943 Nobel Prize for Physiology or Medicine for his isolation and synthesis of vitamin K, a substance that encourages blood clotting (1939), used in medicine and surgery. With the embryologist Edgar Allen (1922-34), he developed assay techniques that facilitated research on sex hormones. Doisy and his associates isolated the sex hormones estrone (theelin, 1929; the first estrogen to be crystallized), estriol (theelol, 1930), and estradiol (dihydrotheelin, 1935). In 1936-39 he isolated two forms of the vitamin, (K1 from lucerne seed and K2 from fish meal, in a pure crystalline form), determined their chemical structures, and synthesized the vitamin.«
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