BRAIN TEASERS
Brain Teasers (page 166)

Brain Teasers (page 166)

puzzles, riddles, mathematical problems, word games, mastermind, cinemania, music, sport... These are the tasks listed 1651 to 1660.
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Find number abc

If caa3c - 5ab5a = 4b187 find number abc. Multiple solutions may exist.
Correct answers: 16
The first user who solved this task is Nasrin 24 T.
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#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: 20
The first user who solved this task is Nasrin 24 T.
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#brainteasers #mastermind
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Calculate the number 5225

NUMBERMANIA: Calculate the number 5225 using numbers [5, 3, 1, 6, 25, 656] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 9
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math #numbermania

There were five people aboard...

There were five people aboard an airplane having engine trouble getting ready to crash, however, there were only four parachutes. Everyone wondered what should be done to determine who should get the parachutes. One person said that he was the smartest thing that hit the face of the Earth, and that he was too smart to die. So, he took one of the parachutes and jumped out of the aircraft. The second person said that she was too important to die, she had children and a family to take care of, and they depended on her to care for them. So, she took one of the parachutes and jumped out of the aircraft. The third person said that he was too important to die because his family depended on him for survival. He was the head of household and the sole bread winner. So, he took one of the parachutes and jumped out of the aircraft. Finally, there were only two people left, and one parachute. One person was a 12 year old boy, and the other was a 65 year old man. The old man said, "Well son, I have lived a good life, and you are too young to die, you have a long life ahead of you. So, you take the last parachute. The boy asked, "Why, Sir?" The old man said, "Well, there is only one parachute left." The little lad said, "Sir there are really two parachutes left." The old gentlemen asked, excitedly, "Yeah? How?" "Well," replied the boy, "you know that guy who thought he was the smartest and greatest thing that hit the face of the Earth? He grabbed my backpack."
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Find number abc

If 30843 - a0a4c = 20c9b find number abc. Multiple solutions may exist.
Correct answers: 18
The first user who solved this task is Nasrin 24 T.
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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: 25
The first user who solved this task is Nasrin 24 T.
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#brainteasers #mastermind
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Calculate the number 1007

NUMBERMANIA: Calculate the number 1007 using numbers [1, 2, 2, 3, 69, 870] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 13
The first user who solved this task is Nasrin 24 T.
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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 (4, 8, 11, 13, 17, 20, 33, 37, 40, 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: 8
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math #magicsquare
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Find number abc

If b5501 - cb408 = 1c0ab find number abc. Multiple solutions may exist.
Correct answers: 16
The first user who solved this task is Nasrin 24 T.
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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: 16
The first user who solved this task is Nasrin 24 T.
CHECK ANSWER
#brainteasers #mastermind
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Calculate the number 9812

NUMBERMANIA: Calculate the number 9812 using numbers [8, 3, 5, 8, 46, 859] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 11
The first user who solved this task is Nasrin 24 T.
CHECK ANSWER
#brainteasers #math #numbermania
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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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Svedberg's colloidal sol patent

In 1909, Swedish chemist Theodor Svedberg filed to patent his method of producing colloidal sols or gels, simultaneously in Great Britain, Germany, Denmark and Switzerland. By 1926, he received the Nobel Prize in Chemistry for his work with disperse systems. In colloidal systems, extremely fine particles are dispersed in a continuous medium, in which they remain suspended indefinitely. In molecular-disperse systems, the particles are large molecules like proteins or haemoglobin. Svedberg invented an ultracentrifuge to investigate them. At 40,000 revolutions/min, the particles were redistributed towards the periphery of the motion. Analysis of photographs of the distribution yielded the molecular weight of the particles.«
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