BRAIN TEASERS
Monthly Archive - September 2015 (page 3)

Monthly Archive - September 2015 (page 3)

brain teasers, puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 21 to 30.
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Which is a winning combination of digits?

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: 61
The first user who solved this task is James Lillard.
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#brainteasers #mastermind
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Calculate the number 9809

NUMBERMANIA: Calculate the number 9809 using numbers [7, 6, 2, 6, 21, 745] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 29
The first user who solved this task is Sanja Šabović.
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#brainteasers #math #numbermania
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First flight of Aerodrome No.5

In 1896, the Aerodrome No. 5 made the first successful flight of an unpiloted, engine-driven, heavier-than-air craft of substantial size. Its inventor, Samuel Pierpont Langley (1834-1906), launched the craft using a spring-actuated catapult mounted on top of a houseboat on the Potomac River, near Quantico, Virginia. Its first flight travelled 1,005-m (3,300-ft), followed by a second of 700 m (2,300 ft) on the same afternoon. Each travelled at a speed of about 25 mph. A few months later, on Nov 28, his Aerodrome No.6, a similar aircraft, accomplished a distance of about 1,460-m (4,790-ft). Langley's scientific work also included astronomy and, from 1887, he was the third Secretary of the Smithsonian Institution.«
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