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Find number abc

If 9bc5a + 2b92b = 11ab80 find number abc. Multiple solutions may exist.

Correct answers: 0

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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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Jacobus Cornelius Kapteyn

Born 19 Jan 1851; died 18 Jun 1922 at age 71.Dutch astronomer who used photography and statistical methods in determining the motions and spatial distribution of stars. Such work was the first major step after the works of William and John Herschel. He tried to solve the questions of space density of stars as a function of distance from the sun, and the distribution of starts according to brightness per unit volume. Some of his results had lasting value, but some were superceded because he had failed to account for the interstellar absorption. In studies using proper motion to determine stellar distances, he discovered stellar motions are not random, as previously thought, but that stars move in two "star streams" (1904). He introduced absolute magnitude and colour index as standard concepts.

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