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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.
Find the country and its capital city, using the move of a chess knight. First letter is L. Length of words in solution: 7,6.
Diophantus was a Greek mathematician who lived in the third century. He was one of the first mathematicians to use algebraic symbols. Most of what is known about Diophantus's life comes from an algebraic riddle from around the early sixth century. The riddle states: Diophantus's youth lasted one sixth of his life. He grew a beard after one twelfth more. After one seventh more of his life, he married. 5 years later, he and his wife had a son. The son lived exactly one half as long as his father, and Diophantus died four years after his son. How many years did Diophantus live?

Rotary disk plow

In 1896, Clement Hardy was issued a patent for the rotary disk plow (No. 556,972). His patent described a rotary-disk plow constructed with one or more plowing disks arranged diagonally to the line of draft and suitable supported by furrow and landside wheels and a suitable metal or wooden frame. The plow disks were designed to be drawn into the earth by their own action and by the weight of the soil lifted by the disks and carried on their faces and have a cutting action on the bottom of the furrow instead of scraping, thereby enabling much reduction of the machinery's weight that had previously been thought necessary in this class of plows in order to force the disks into the soil and hold them to their work.[Image: top view, showing seat to left of rear wheel.]

A man was pulled over for spee...

A man was pulled over for speeding down the highway; the officer came to the driver’s window and asked, "Sir, may I see your driver’s license and registration?" The man said, "Well officer I don't have a license, it was taken away for a DUI." The officer, in surprise, said," What, do you have a registration for the vehicle?" So the man replied, "No sir, the car is not mine I stole it, but I am pretty sure I saw a registration card in the glove box when I put the gun in it." The officer stepped back, "There is a gun in the glove box?!?" The man sighed and said, "Yes sir, I used it to kill the woman who owns the car before I stuffed her in the trunk." The officer steps toward the back of the car and says," Sir do not move, I am calling for backup." The officer calls for backup and about ten minutes another highway patrolman arrives. He walks up to the window slowly and asks the man for his driver’s license and registration. The man said," Yes officer here it's right here." It all checked out so the officer said," Is there a gun in the glove box sir?" The man laughs and says," No officer why would there be a gun in the glove box." He opened the glove box and showed him that there was no gun. The second officer asked him to open the trunk because he had reason to believe that there was a body in it. The man agrees and opens the trunk, no dead body. The second officer says, "Sir I do not understand, the officer that pulled you over said that you did not have a license, the car was stolen, there was a gun in the glove box, and a dead body in the trunk." The man looks the officer in the eyes and says, "Yeah and I'll bet he said I was speeding too."
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