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Find number abc

If b8ac4 - ba92a = ca88 find number abc. Multiple solutions may exist.

Correct answers: 28

The first user who solved this task is Nasrin 24 T.

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Mad men are given a test to ch...

Mad men are given a test to check their mental state. The instructor draws a door on the wall and orders them to go out.
They start rushing to the door but one remains sitting. The instructor goes to him and asks; “why didn’t you join the others?” He replies, "let them fight they forgot I have the keys"

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John William Draper

Died 4 Jan 1882 at age 70 (born 5 May 1811). English-American chemist who pioneered in photochemistry. He recognized that light initiated chemical reactions as molecules absorbed light energy. The Draper Point is the name given to the point at which all substances glow a dull red (about 525 degrees C.). He described the effect of rise in temperature as the addition of more and more of the visible light region produced a white glow (1847). His interest in spectroscopy and photography was applied to give the first astronomical photograph. Its subject was the moon (1840). He also studied photographs of the solar spectrum to show that contained both infrared and ultraviolet light. His photographs of persons include the oldest surviving photographic portrait (1840), and he was one of the first to produce microphotographs.

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