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: 149
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: 56
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

A lawyer's dog, running about...

A lawyer's dog, running about unleashed, beelines for a butcher shop and steals a roast.
Butcher goes to lawyer's office and asks, "If a dog running unleashed steals a piece of meat from my store, do I have a right to demand payment for the meat from the dog's owner?"
The lawyer answers, "Absolutely."
"Then you owe me $8.50. Your dog was loose and stole a roast from me today."
The lawyer, without a word, writes the butcher a check for $8.50.
In a few days, the butcher opens the mail and finds an envelope from the lawyer: $20 due for a consultation.
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Word Association: BOX, INSTRUMENT, GENRE, SOUND

Word Association: BOX, INSTRUMENT, GENRE, SOUND
Correct answers: 117
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: 137
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: 142
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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Brook Taylor

Born 18 Aug 1685; died 29 Dec 1731 at age 46.British mathematician, best known for the Taylor's series, a method for expanding functions into infinite series. In 1708, Taylor produced a solution to the problem of the centre of oscillation. His Methodus incrementorum directa et inversa (“Direct and Indirect Methods of Incrementation,” 1715) introduced what is now called the calculus of finite differences. Using this, he was the first to express mathematically the movement of a vibrating string on the basis of mechanical principles. Methodus also contained Taylor's theorem, later recognized (1772) by Joseph Lagrange as the basis of differential calculus. A gifted artist, Taylor also wrote on basic principles of perspective (1715) containing the first general treatment of the principle of vanishing points.«
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