Replace the question mark with a number
[2706] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 350 - The first user who solved this task is Roxana zavari
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 350
The first user who solved this task is Roxana zavari.
#brainteasers #math #riddles
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Doctor visit

A man and his wife were making their first doctor visit prior to the birth of their first child. After everything checked out, the doctor took a small stamp and stamped the wife's stomach with indelible ink.

The couple was curious about what the stamp was for, so when they got home, he dug out his magnifying glass to try to see what it was. In very tiny letters, the stamp said, "When you can read this, come back and see me."

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Musical Arcs

In 1900, Nature reported the Musical Arcs invented by William Du Bois Duddell, an English physicist. By means of an arrangement of electric currents he produced a musical note from an arc lamp that could be altered to any pitch is obtained and a tune played. This may be regarded as the first fully electric instrument. While investigating the noise produced by the operation of carbon arc lamps - anything from a low hum to a high-pitched whistle - he found that adding resonance circuits adjusted the pitch of the sounds. His Singing Arc demonstrated this phenomenon using a keyboard connected to an arc lamp, giving audible results without any amplifier. He toured the country with his Singing Arc, as a novelty performance.«*
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