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Find number abc

If c71bc + 2b844 = b4aa7 find number abc. Multiple solutions may exist.

Correct answers: 20

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

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Flying Her Broom

A witch was flying her broom along when she noticed that all the other witches were flying on vacuum cleaners.
She thought, "Am I the only one still driving a stick?"

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Railroad safety

In 1870, Thomas S. Hall of Stamford, Conn., received a patent for the first automatic electric block railroad signal system in the U.S. (No. 103,875). When a train entered a block of track, Hall's electromagnetic device automatically set a signal when the locomotive struck a lever fastened to the rail. The signal was set to danger until the train cleared the block. After Hall invented the device in 1867, it was tried out on the New York and Harlem Railroad.

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