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Find number abc

If 7a7bc - abb70 = 791c find number abc. Multiple solutions may exist.

Correct answers: 20

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Christopher Hansteen

Born 26 Sep 1784; died 15 Apr 1873 at age 88.Norwegian astronomer and physicist who is noted for his research in geomagnetism. In 1701, Edmond Halley had already published a map of magnetic declinations, and the subject was studied by Humboldt, de Borda, and Gay-Lussac, among others. Hansteen collected available data and also mounted an expedition to Siberia, where he took many measurements for an atlas of magnetic strength and declination.

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