Replace the question mark with a number
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 222
The first user who solved this task is Eugenio G. F. de Kereki.
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Charles GoodyearDied 1 Jul 1860 at age 59 (born 29 Dec 1800).American inventor who baked rubber mixed with sulphur and discovered the vulcanization process which made rubber practical as a commercial product. Previously, rubber was of limited use since it froze hard in winter and sticky in summer. After years of persistent experimentation, Goodyear had created a tough, cured compound, able to withstand heat and stress. Sadly, he was a poor businessman, unable to profit from his invention or effectively patent it abroad. The “vulcanized” name was applied by English rubber pioneer Thomas Hancock, using the sugggestion of a friend to name the process after Vulcan, the Roman god of fire. Nor was Goodyear ever connected to the Goodyear Tire & Rubber Co. which was named in his honour.« |