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Calculate the number 399

NUMBERMANIA: Calculate the number 399 using numbers [7, 6, 7, 2, 12, 110] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 16

The first user who solved this task is Djordje Timotijevic.

#brainteasers #math #numbermania

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Moving Testimony

The second guy says, "I would like to hear that I was a wonderful husband and school teacher which made a huge difference in our children of tomorrow."
The last guy replies, "I would like to hear them say, 'Look! He's moving!'"

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John Evershed

Born 26 Feb 1864; died 17 Nov 1956 at age 92. English astronomer who discovered (1909) the Evershed effect - the horizontal motion of gases outward from the centres of sunspots. While photographing solar prominences and sunspot spectra, he noticed that many of the Fraunhofer lines in the sunspot spectra were shifted to the red. By showing that these were Doppler shifts, he proved the motion of the source gases. This discovery came to be known as the Evershed effect. He also gave his name to a spectroheliograph, the Evershed spectroscope. He had been introduced to workshop skills in his youth by his elder brother, Sydney Evershed. John made optical instruments reflecting his budding interest in astronomy. Sydney went on to a career with electrical devices.

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