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Find number abc

If 740a7 + b74b0 = a3a4c7 find number abc. Multiple solutions may exist.

Correct answers: 17

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

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Doctor: What’s wrong with y...

Doctor: What’s wrong with your brother?
Boy: He thinks he is a chicken.
Doctor: really? How long has this been going on?
Boy: Five years.
Doctor: Five years!
Boy: We would have brought him in earlier, but we needed the eggs.

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Comet

In 1864, Giovanni Batista Donati (1827-73) made the first spectroscopic observations of a comet tail (from the small comet, Tempel, 1864 II). At a distance from the Sun the spectrum of a comet is identical to that of the Sun, and its visibility is due only to reflected sunlight. Donati showed that comet tail formed close to the Sun contains luminous gas. In the spectrum of light from the comet tail, Donati saw three absorption lines bands superimposed on a continuous spectrum, which he named alpha, beta and gamma, and are now known as the Swan bands. These bands were also seen in a comet tail viewed by Pietro Secchi in 1866. Sir William Huggins (1868) identified that these were due to the presence of carbon (molecular carbon, C2).[Image: Comet tail of Comet West 1976 VI, computer generated false colour image.]

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