BRAIN TEASERS
The Most Difficult Tasks (page 80)

The Most Difficult Tasks (page 80)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 791 to 800.
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MAGIC SQUARE: Calculate A*B*C

The aim is to place the some numbers from the list (7, 13, 15, 16, 17, 19, 20, 22, 24, 25, 30, 46, 56) 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: 1
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Find number abc

If 5b48a + 8cb1c = 14cabb find number abc. Multiple solutions may exist.
Correct answers: 1
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Find number abc

If ac6b7 + 1372a = 10a416 find number abc. Multiple solutions may exist.
Correct answers: 1
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Competition Of A Nation

The Americans and Russians at the height of the arms race realized that if they continued in the usual manner they were going to blow up the whole world.
One day they sat down and decided to settle the whole dispute with one dog fight. They'd have five years to breed the best fighting dog in the world and whichever side's dog won would be entitled to dominate the world. The losing side would have to lay down its arms. The Russians found the biggest meanest Doberman and Rottweiler dogs in the world and bred them with the biggest meanest Siberian wolves. They selected only the biggest and strongest puppy from each litter, killed his siblings, and gave him all the milk. The used steroids and trainers and after five years came up with the biggest meanest dog the world had ever seen. Its cage needed steel bars that were five inches thick and nobody could get near it.
"When the day came for the fight, the Americans showed up with a strange animal. It was a nine foot long Dachshund. Everyone felt sorry for the Americans because they knew there was no way that this dog could possibly last ten seconds with the Russian dog.
"When the cages were opened up, the Dachshund came out and wrapped itself around the outside of the ring. It had the Russian dog almost completely surrounded. When the Russian dog leaned over to bite the Dachshund's neck, the Dachshund leaned up and consumed the Russian dog in one bite. There was nothing left at all of the Russian dog.
The Russians came up to the Americans shaking their heads in disbelief. `We don't understand how this could have happened. We had our best people working for five years with the meanest Doberman and Rottweiler dogs in the world and the biggest meanest Siberian wolves."
"That's nothing", an American replied. "We had our best plastic surgeons working for five years trying to make an alligator look like a Dachshund.'"
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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: 1
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#brainteasers #mastermind
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Find number abc

If 4a9cc + 991b4 = 14a111 find number abc. Multiple solutions may exist.
Correct answers: 1
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#brainteasers #math
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Calculate the number 454

NUMBERMANIA: Calculate the number 454 using numbers [1, 6, 1, 8, 18, 158] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 1
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#brainteasers #math #numbermania
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Find number abc

If aa3bc - bac55 = 195cb find number abc. Multiple solutions may exist.
Correct answers: 1
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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: 1
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#brainteasers #mastermind
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Calculate the number 9274

NUMBERMANIA: Calculate the number 9274 using numbers [5, 8, 2, 9, 47, 681] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 1
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#brainteasers #math #numbermania
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Find number abc

If 6a777 - bb827 = 57a5c find number abc. Multiple solutions may exist.
Correct answers: 1
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#brainteasers #math
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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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Ross Granville Harrison

Died 30 Sep 1959 at age 89 (born 13 Jan 1870).American zoologist who developed the first successful animal-tissue cultures and pioneered organ transplantation techniques. In an early experiment, using tissue grafting techniques, he joined parts of embryos from differently coloured frogs to observe the movement of cells during the subsequent development of the embryos produced in this way. In another experiment, he took tissue from an amphibian embryo that would have formed a left limb, inverted and transferred it to the embryo's right side, where it formed a right limb. He discovered the hanging-drop culture method (1907), a new method of studying cells, by which he kept fragments of living tissue alive in suitable media and watch them multiply. Using this technique, he settled a controversy about the embryonic origins of nerve fibres. The hanging-drop method has also been valuable in oncology, genetics, virology and other fields.
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