Replace the question mark with a number
[3763] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 70 - The first user who solved this task is Eugenio G. F. de Kereki
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 70
The first user who solved this task is Eugenio G. F. de Kereki.
#brainteasers #math #riddles
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How You Made Money

A young man asked an old rich man how he made his money.
The old guy fingered his worsted wool vest and said, "Well, son, it was 1932. The depth of the Great Depression. I was down to my last nickel.
"I invested that nickel in an apple. I spent the entire day polishing the apple and, at the end of the day, I sold the apple for ten cents.
"The next morning, I invested those ten cents in two apples. I spent the entire day polishing them and sold them at 5:00 pm for 20 cents. I continued this system for a month, by the end of which I'd accumulated a fortune of $1.37."
"And that's how you built an empire?" the boy asked.
"Heavens, no!" the man replied. "Then my wife's father died and left us two million dollars."
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Paul Crutzen

Born 3 Dec 1933. Paul Josef Crutzen is a Dutch chemist who received the 1995 Nobel Prize for Chemistry for demonstrating, in 1970, that chemical compounds of nitrogen oxide accelerate the destruction of stratospheric ozone, which protects the Earth from the Sun's ultraviolet radiation. His work, published in 1970, that showed that the nitrogen oxides NO and NO2 react catalytically with ozone, thus accelerating the rate of ozone breakdown to O2 in the stratosphere. These nitrogen oxides are formed principally by decay of nitrous oxide (N2O) which originates from microbiological transformations in the soil. He shared the prize with chemists Mario Molina and F. Sherwood Rowland, who discovered in 1974 that manufactured chlorofluorocarbon gases also contribute to ozone depletion.
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