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Calculate the number 8427

NUMBERMANIA: Calculate the number 8427 using numbers [3, 9, 3, 8, 91, 950] 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.

#brainteasers #math #numbermania

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Mobius strip

A Mobius strip walks into a bar crying. The bartender says: what's wrong buddy?
The Mobius strip replies:
Oh, where do I even begin

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Book matches

In 1892, book matches were patented by Joshua Pusey of Lima, Ohio, No. 483165. He subseqerntly sold the patent rights to the Diamond Match Company of Barberton, Ohio. The Diamond Match Company was formulated as a conglomerate and built by absorbing a number of smaller match manufacturing companies. They were also the first company involved in book match making of any significance. In 1895, production exceeded 150,000 matchbooks a day. Diamond's objective was to produce a quality matchbook for sale to the public (not given freely as was traditional fifty years later). The first Diamond matchbooks assembled were a dangerous and flimsy novelty, but they were improved. Later, they were sold to companies and carried their advertising.

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