BRAIN TEASERS
Monthly Archive - January 2017 (page 19)

Monthly Archive - January 2017 (page 19)

brain teasers, puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 181 to 190.
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Find number abc

If 9213c - a22b9 = 398aa find number abc. Multiple solutions may exist.
Correct answers: 58
The first user who solved this task is Djordje Timotijevic.
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Rotary dial telephone

In 1923, the first patent application on a rotary-dial telephone was submitted in France by Antoine Barnay.
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