BRAIN TEASERS
The Most Difficult Tasks (page 731)

The Most Difficult Tasks (page 731)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 7301 to 7310.
Register with your Google Account and start collecting points.
Check your ranking on list.
[link]

During what month do people sl...

During what month do people sleep the least?
Correct answers: 101
The first user who solved this task is Djordje Timotijevic.
CHECK ANSWER
#brainteasers #riddles
[link]

If in a certain code, TWENTY...

If in a certain code, TWENTY is written as 863985 and ELEVEN is written as 323039, how is TWELVE written in that code?
Correct answers: 101
The first user who solved this task is Roxana zavari.
CHECK ANSWER
#brainteasers #wordpuzzles #riddles
[link]

Look carefully the picture a...

Look carefully the picture and guess the movie title.
Correct answers: 101
The first user who solved this task is Roxana zavari.
CHECK ANSWER
#brainteasers #movie #film #cinemania

Turn-down service in posh hotels

Posh hotels have a turn-down service. I had never heard of this and there was a knock at the door and a woman said, I've come to turn down your bed. To which I said, Well many women have in the past. Why should you be any different?

Michael McIntyre (December 21 1976-)

Picture: Andrew Crowley

Jokes of the day - Daily updated jokes. New jokes every day.
[link]

Can you find out the number ...

Can you find out the number of triangles in the picture given?
Correct answers: 101
The first user who solved this task is Djordje Timotijevic.
CHECK ANSWER
#brainteasers #math #riddles
[link]

How many triangles?

How many triangles?
Correct answers: 101
The first user who solved this task is Sanja Šabović.
CHECK ANSWER
#brainteasers #math #riddles
[link]

What is the missing number?

What is the missing number?
Correct answers: 102
The first user who solved this task is Chandu Rajyaguru.
CHECK ANSWER
#brainteasers #math #riddles
[link]

A robber came into my store ...

A robber came into my store and stole $100 from the register without my knowledge. A few minutes later, the same guy came back with the $100 he stole and purchased $70 worth of items and I gave him $30 in change. How much money did I lose?
Correct answers: 102
The first user who solved this task is Thinh Ddh.
CHECK ANSWER
#brainteasers #riddles
[link]

What number comes next?

Look at the series (2378, 4994, 6116), determine the pattern, and find the value of the next number!
Correct answers: 102
The first user who solved this task is Slobodan Strelac.
CHECK ANSWER
#brainteasers #math
[link]

What has a head and a tail, ...

What has a head and a tail, but no body?
Correct answers: 103
The first user who solved this task is Sanja Šabović.
CHECK ANSWER
#brainteasers #riddles
[link]

How many ducks are there in total?

There are two ducks in front of a duck, two ducks behind a duck and a duck in the middle. How many ducks are there in total?
Correct answers: 103
The first user who solved this task is Erkain Mahajanian.
CHECK ANSWER
#brainteasers #riddles
PREVIOUS PAGE
NEXT PAGE
Follow Brain Teasers on social networks
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.
Last Correct Answer

Top 10 Users (1174)

1. H Tav
5861
2. c. raj.
5777
3. Nasrin 24 T
5731
4. Fazil Hashim
5718
5. Thinh Ddh
5557
6. Alfa Omega
4681
7. Djordje Timotijevic
4549
8. Mita Kojd
4525
9. Jakubovski Vladimir
4443
10. Chandu Rajyaguru
4419
See full ranking list

Metric System

In 1960, the fourth legal definition of the metre was made to be 1,650,763.73 wavelengths in vacuum of the orange-red light radiation of the krypton-86 atom (transition between levels 2p10 and 5d5). It was adopted at the 11th meeting of the Conférence Générale des Poids et Mesures (CGPM), which also specified the seven basic units of the SI system. It was superceded by a fifth definition of the metre on 20 Oct 1983, based on the speed of light. The definition in terms of wavelengths of the kryton spectral line wasthen100 times more accurate than the previous third legal definition adopted in 1889. (The third legal definition on 28 Sep 1889, was based on the distance between two reference markson the International prototype metre bar, made of platinum-iridium, (90% Pt, 10% Ir), cross section X, at a 0 °C temperature.)«[Image: Krypton-86 gas excited by high-frequency oscillator, in a vessel cooled to the temperature of liquid nitrogen to produce precise monochromatic radiation. The special lamp is placed in front of an interferometer calibrated in wavelengths.]
This site uses cookies to store information on your computer. Some are essential to help the site properly. Others give us insight into how the site is used and help us to optimize the user experience. See our privacy policy.