Replace the question mark with a number
[4346] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 146 - The first user who solved this task is Manguexa Wagle
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 146
The first user who solved this task is Manguexa Wagle.
#brainteasers #math #riddles
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Not expecting to do well on th...

Not expecting to do well on the economics exam, Bill was heartened by the first question: In any given year, and to the nearest ton, how much wheat did the United States export?
Smiling confidently, he wrote, "In 1492, none."
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Photophone

In 1882, the photophone was demonstrated by Alexander Graham Bell and Charles Sumner Tainter. In their device, a mirrored silver disc was made to vibrate by speech from a speaking tube. Light reflected off the disc was focused by a parabolic dish onto a selenium photocell. The variations in the reflected light were converted into electrical signals carried to headphones.
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