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Find number abc

If ab5bc - aa546 = 991 find number abc. Multiple solutions may exist.

Correct answers: 107

The first user who solved this task is Manguexa Wagle.

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Childhood is like being drunk

Childhood is like being drunk. Everyone remembers what you did, except you.

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Edison patent

In 1878, Thomas A. Edison was issued a patent for “Quadruplex-Telegraph Repeaters” (U.S. No. 209,241). This invention is an improved method for one quadruplex circuit to repeat into another quadruplex circuit. The patent describes the electromagnets, local circuits, switches and connections. The circuits work into and operate each other, so that the message are repeated automatically into one circuit by the receiving instrument of the other circuit, instead of the finger key being operated by hand.

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