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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 135

The first user who solved this task is Thinh Ddh.

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A blond and her blond boyfrien...

A blond and her blond boyfriend went for a walk along the river. The blond walked across alone on a wooden bridge. After crossing the river, the bridge fell down. She called across to her blond boyfriend telling him that she couldn't get back.
He yelled in response, "Wait until dark, and I will shine my flash light across the river. Get on the light beam and walk back."
She replied, "No, I'll get half way across the river, and you will turn the light off on me!"

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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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