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Find number abc

If c8368 - a91c1 = a9a1b find number abc. Multiple solutions may exist.

Correct answers: 0

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Tooth Decay

I use an extra sensitive toothpaste...
It doesn't like it when I use other toothpastes.

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Roller coaster

In 1884, the first gravity-powered American roller coaster that was commercially successful was put in operation at Coney Island, N.Y., the invention of La Marcus Thompson (patent No. 310,966). Passengers rode a train on undulating tracks over a wooden structure 600-ft long. The train started at a height of 50-ft on one end and ran downhill by gravity until its momentum died. Passengers then left the train and attendants pushed the car over a switch to a higher level. The passengers returned to their sideways facing seats and rode back to the original starting point. Admission on the Thompson Switchback Railway was 5 cents and he grossed an average of $600 / day. Within 4 yrs he had built about 50 more across the U.S. and in Europe.

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