BRAIN TEASERS
Monthly Archive - October 2013

Monthly Archive - October 2013

brain teasers, puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 1 to 10.
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On which finger will she stop?

A little girl counts from 1 to 1000 using the fingers of her left hand as follows. She starts by calling her thumb 1, the first finger 2, middle finger 3, ring finger 4, and little finger 5. Then she reverses direction, calling the ring finger 6, middle finger 7, the first finger 8, and her thumb 9, after which she calls her first finger 10, and so on. If she continues to count in this manner, on which finger will she stop?
Correct answers: 148
The first user who solved this task is s.n.d.rishita chintapalli.
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#brainteasers #riddles
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Calculate the number 100

NUMBERMANIA: Calculate the number 100 using numbers [1, 1, 4, 2, 20, 75] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 55
The first user who solved this task is Eric Newton.
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#brainteasers #math #numbermania
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Find the area of the shaded figure

Express result to the accuracy of 2 decimal.
Correct answers: 42
The first user who solved this task is Djordje Timotijevic.
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#brainteasers #math

An Elephant And Turtle

An elephant was drinking out of a river one day, when he spotted a turtle asleep on a log. So, he ambled on over and kicked it clear across the river.
"What did you do that for?" Asked a passing giraffe.
"Because I recognized it as the same turtle that took a nip out of my trunk 53 years ago."
"Wow, what a memory" commented the giraffe.
"Yes," said the elephant, "turtle recall".
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Word Association: BOX, INSTRUMENT, GENRE, SOUND

Word Association: BOX, INSTRUMENT, GENRE, SOUND
Correct answers: 116
The first user who solved this task is Eric Newton.
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#brainteasers #wordpuzzles #wordassociations
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Which number should replace the question mark?

FUNNY MATH: Which number should replace the question mark?
Correct answers: 78
The first user who solved this task is Slobodan Strelac.
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#brainteasers #math #riddles
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Word Association: FAST, SOUL, ORGANIC, CHINESE

Word Association: FAST, SOUL, ORGANIC, CHINESE
Correct answers: 136
The first user who solved this task is Eric Newton.
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#brainteasers #wordpuzzles #wordassociations
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Which number should replace the question mark?

FUNNY MATH: Which number should replace the question mark?
Correct answers: 141
The first user who solved this task is Eric Newton.
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#brainteasers #math #riddles
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Calculate 9*(29+321+151)

FUNNY MATH: Calculate 9*(29+321+151) :)
Correct answers: 23
The first user who solved this task is Slobodan Strelac.
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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: 62
The first user who solved this task is Sanja Šabović.
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#brainteasers #mastermind
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Find the area of the shaded figure

Express result to the accuracy of 2 decimal.
Correct answers: 66
The first user who solved this task is Djordje Timotijevic.
CHECK ANSWER
#brainteasers #math
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Philipp Lenard

Died 20 May 1947 at age 84 (born 7 Jun 1862). Philipp Eduard Anton von Lenard was a Hungarian-German physicist who received the 1905 Nobel Prize for Physics for his research on cathode rays. He discovered they could leave a cathode ray tube, penetrate thin metal sheets, and travel a short distance in the air, which would become conducting.. In 1902, he observed that a free electron (as in a cathode ray) must have at least a certain energy to ionize a gas by knocking a bound electron out of an atom. His estimate of the required ionization energy for hydrogen was remarkably accurate. Also in 1902, he showed that the photoelectric effect produces the same electrons found in cathode rays, that the photoelectrons are not merely dislodged from the metal surface but ejected with a certain amount of energy.
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