MATH PUZZLE: Can you replace...MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 59
The first user who solved this task is Djordje Timotijevic.
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Robert John KaneDied 16 Feb 1890 at age 80 (born 24 Sep 1809). Irish chemist whose book, The Industrial Resources of Ireland (1844), provided a study of the scientific and potential economic value of developing the country's natural resources. Kane began scientific research in his youth at his father's industrial chemicals factory. His first papers were published as a teenager. By the age of 22, he had already written a book, Elements of Practical Pharmacy, and was a professor of chemistry at Dublin's Apothecaries' Hall. In 1833, age 24, he published a paper in which he was the first to propose the existence of the -C2H5 ethyl radical (Dublin Journal of Medical and Chemical Sciences, which he founded). His research spanned inorganic, organic, physical, biological and applied chemistry.«