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Find number abc

If 7c8b7 - b0b57 = acaa0 find number abc. Multiple solutions may exist.

Correct answers: 6

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Knock Knock Collection 026

Knock Knock
Who's there?
Bitter Bianca!
Bitter Bianca who?
Bitter Bianca next train out of here, pardner!
Knock Knock
Who's there?
Bjorn!
Bjorn who?
Bjorn Free!
Knock Knock
Who's there?
Bo!
Bo who?
Bo Geste!
Knock Knock
Who's there?
Bolivia!
Boliva who?
Boliva me, I know what I'm talking about!
Knock Knock
Who's there?
Bologna!
Bologna who?
Bologna & cheese!

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William Du Bois Duddell

Died 4 Nov 1917 at age 45 (born 1 Jul 1872).English electrical engineer who invented the sensitive moving coil oscillograph able to photographically record a light spot tracing the oscillations of an electrical voltage, and other electrical instruments. He devised what may be regarded as the first electric musical instrument, the Singing Arc (1899), based on the sounds emitted by an electric carbon arc lamp when its supply voltage was varied. It was an outcome of his investigation to solve the problem of the undesirable humming or whining noises generated by carbon arc street lighting. This research discovered an associated principle of negative resistance. The audio frequencies were generated by switching suitable resonant circuits to the arc. Duddell died aged only 45 years old.«

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