Find number abc
[7265] Find number abc - If ab6c3 + cbaaa = 69c68 find number abc. Multiple solutions may exist. - #brainteasers #math - Correct Answers: 5
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Find number abc

If ab6c3 + cbaaa = 69c68 find number abc. Multiple solutions may exist.
Correct answers: 5
#brainteasers #math
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A man realized he needed to pu...

A man realized he needed to purchase a hearing aid, but didn't want to spend a lot of money. "How much do they cost?" he asked the salesman.
"Anything from $2 to $2,000."
"Can I see the $2 model?" said the customer.
The salesman put the device around the man's neck, and said: "You just stick this button in your ear and run this little string down into your pocket."
"How does it work?" asked the customer.
"For $2, it doesn't work," said the salesman. "But when people see it on you, they'll talk louder."
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Black American invention

In 1888, a U.S. patent was issued for the railway signal to the Black American inventor, A.B. Blackburn (No. 376,362). The type of signal was that designed to be operated by the wheels of a train. A lever was depressed as a train wheel travelled over it, to remotely operate an alert through a mechanical linkage upon the passing of the train. It was designed for use upon a single track railway line for trains passing in one direction. To provide a signal for trains passing in the opposite direction, a similar apparatus would be applied on the opposite rail. This patent was an improvement in mechanical design of his earlier patent No. 309,517 on 23 Dec 1884, in which he also described how a gong was activated to provide the alert.«[Image: detail from patent diagram showinf device beside a section of rail.]
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