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What number should replace the X to the magic square?

What number should replace the X to the magic square? Author: Nebojsa Jevtovic

Correct answers: 60

The first user who solved this task is Sanja Šabović.

#brainteasers #math #riddles #magicsquare

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Playing Doctor

Steve complained to his friend Al that lovemaking with his wife was becoming routine and boring.
"Get creative buddy. Break up the monotony. Why don't you try playing doctor for an hour?"
"Sounds great," Steve replied, "but how do you make it last for an hour?"
"Hell, just keep her in the waiting room for 45 minutes!"

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Lewis Fry Richardson

Died 30 Sep 1953 at age 71 (born 11 Oct 1881). British physicist and psychologist who first applied mathematics to accurate weather prediction. Richardson applied the mathematical method of finite differences to predicting the weather (1922). In his life, he held various posts: at the National Physical Laboratory, the Meteorological Office, and several university posts in physics or technology. Also, he was a chemist with National Peat Industries and in charge of the physical and chemical laboratory of the Sunbeam Lamp Co. Early application of mathematical techniques for systematically forecasting the weather were limited by extensive computation time: three months to predict weather for the next 24 hours. With electronic computers available after WW II made his methods became practical. He wrote several books applying mathematics to the causes of war. He contributed to calculus and the theory of diffusion for eddy-diffusion in the atmosphere. The Richardson number, a quantity involving gradients (change over distance) of temperature and wind velocity, is named after him.

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