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Find number abc

If b9bb7 - b9cbc = ca6 find number abc. Multiple solutions may exist.

Correct answers: 64

The first user who solved this task is Djordje Timotijevic.

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A man and his wife were sittin...

A man and his wife were sitting in the living room and he said to her, "Just so you know, I never want to live in a vegetative state, dependent on some machine and fluids from a bottle. If that ever happens, just pull the plug."
His wife got up, unplugged the TV and threw out all of his beer.

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Radium

In 1898, Polish-French scientist Marie Sklodowska Curie discovered the radioactive element radium while experimenting with pitchblende, a common uranium ore. She had observed that this ore was more radioactive than refined uranium. This indicated that there must be another element, even more radioactive than uranium, mixed in with this ore. During the years between 1899 and 1902, Marie Curie dissolved, filtered and repeatedly crystallized nearly three tons of pitchblende. The goal of that work was a refined sample of the element - the yield was about 0.1 gram. This was enough for spectroscopic examination, and to determine the exact atomic weight of radium. This discovery, along with the element polonium, earned her a second Nobel Prize in 1911.

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