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Find number abc

If 5bb3c - 1ca5a = 415b5 find number abc. Multiple solutions may exist.

Correct answers: 3

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A radio announcer was introduc...

A radio announcer was introducing a record, "The next one is for Charlotte Burke, who is a hundred and eleven. Hey, Charlotte, that's a ripe old age, isn't it?"
There was a short pause and then the DJ said, "I'm sorry, I got it wrong. This next one is for Charlotte Burke, who is ill."

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Vacuum tube

In 1906, Dr. Lee DeForest (26 Aug 1873 - 30 Jun 1961), one of the “fathers of radio,'' announced his three-element electrical vacuum tube (now known as a triode) to a meeting of the American Institute of Electrical Engineers He had discovered that when a mesh, or grid, of wire was placed between the filament and collector “plate” in a diode tube (first made by J. Ambrose Fleming, 1904), a large voltage-amplifying effect could be produced. DeForest patented this vacuum tube on 15 Jan 1907. The ability of this tube to amplifiy weak signals was an invention as great as radio itself, because it made long-distance communication possible.[Image: early DeForest Audion]

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