BRAIN TEASERS
The Most Difficult Tasks (page 419)

The Most Difficult Tasks (page 419)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 4181 to 4190.
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Find number abc

If 414b4 + b452a = c59a0 find number abc. Multiple solutions may exist.
Correct answers: 30
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math
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Remove 3 letters from this seq...

Remove 3 letters from this sequence (LGKITTLEE) to reveal a familiar English word.
Correct answers: 30
The first user who solved this task is Nasrin 24 T.
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#brainteasers #wordpuzzles
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Find number abc

If 55ab6 - c57aa = 40cb7 find number abc. Multiple solutions may exist.
Correct answers: 30
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math

Fig Leaf Found

A little boy opened the large old family Bible, and he looked with fascination at the ancient pages as he turned them one by one.He was still in Genesis when something fell out of the Bible. He picked it up and looked at it closely. It was a very large old tree leaf that had been pressed between the pages of the Bible long ago."Momma, look what I found!" the boy called out."What do you have there?" his mother asked.With astonishment in his voice, the young boy answered, "I think it's Adam's underwear!"
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Find number abc

If 8651a + 8422c = 1babcc find number abc. Multiple solutions may exist.
Correct answers: 30
The first user who solved this task is Nasrin 24 T.
CHECK ANSWER
#brainteasers #math
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Calculate A*B-C+D

Look at the series (10, 19, 36, D, C, A, 520, 1033, 2058, 4107, B, 16397, ...), determine the pattern, and find the unknown values (A, B, C and D) and calculate A*B-C+D!
Correct answers: 30
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math
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Find number abc

If 8ca83 + bb929 = c2aac2 find number abc. Multiple solutions may exist.
Correct answers: 30
The first user who solved this task is Nasrin 24 T.
CHECK ANSWER
#brainteasers #math
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Find number abc

If a99bb - 18717 = 5118c find number abc. Multiple solutions may exist.
Correct answers: 30
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math
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Find number abc

If b1a30 + 6c047 = c0a77 find number abc. Multiple solutions may exist.
Correct answers: 30
The first user who solved this task is Nasrin 24 T.
CHECK ANSWER
#brainteasers #math
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Find number abc

If aac0b - a0c71 = 19c7 find number abc. Multiple solutions may exist.
Correct answers: 30
The first user who solved this task is Nasrin 24 T.
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: 30
The first user who solved this task is Nílton Corrêa de Sousa.
CHECK ANSWER
#brainteasers #mastermind
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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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Aero-engine

In 1880, Colonel Beaumont's air-engine for propelling railway carriages was successfully tried at Woowich (a little steam is used). His system largely employed in various ways by Paris Compressed Air company was described to the British Association at Newcastle-upon-Tyne (Sep 1889).[* p.30]
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