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Find number abc

If 9290a - 7ba9b = 2bcb4 find number abc. Multiple solutions may exist.

Correct answers: 46

The first user who solved this task is Djordje Timotijevic.

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A wife was having trouble with...

A wife was having trouble with the idea of turning 30 and was oversensitive to any signs of advancing age. When she found a prominent gray hair in her bangs, she pointed to her forehead and asked her husband, "Oh no, have you seen this?"
"What?" he asked, "the wrinkles?"

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Gustav Robert Kirchhoff

Died 17 Oct 1887 at age 63 (born 12 Mar 1824).German physicist who, with Robert Bunsen, established the theory of spectrum analysis (a technique for chemical analysis by analyzing the light emitted by a heated material), which Kirchhoff applied to determine the composition of the Sun. He found that when light passes through a gas, the gas absorbs those wavelengths that it would emit if heated, which explained the numerous dark lines (Fraunhofer lines) in the Sun's spectrum. In his Kirchhoff's laws (1845) he generalized the equations describing current flow to the case of electrical conductors in three dimensions, extending Ohm's law to calculation of the currents, voltages, and resistances of electrical networks. He demonstrated that current flows in a zero-resistance conductor at the speed of light.

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