Calculate 3x5x2
If 3x4=20 and 5x4=32 then 3x5x2=?Correct answers: 67
The first user who solved this task is Djordje Timotijevic.
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Carborundum furnaceIn 1896, Edward G. Acheson was issued a U.S. patent for an electric furnace used to produce carborundum (silicon carbide), one of the hardest industrial substances (No. 560,291). The furnace used an electric current passed through a core of carbon rods to produce a strong heating effect resulting from their resistance.« |