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Calculate the number 407

NUMBERMANIA: Calculate the number 407 using numbers [3, 3, 9, 9, 95, 420] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 21

The first user who solved this task is Djordje Timotijevic.

#brainteasers #math #numbermania

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Rain Rain Go Away

It’s been raining for days now and my husband seems very depressed by it...
He keeps standing by the window, staring. If it continues, I’m going to have to let him in.

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Josiah Dwight Whitney

Born 23 Nov 1819; died 19 Aug 1896 at age 76. American geologist and chemist, known for his studies of the regional geology of California. Whitney was an independent consulting expert in mining (1849-54) when he was appointed chemist for the state of Iowa and professor of mineralogy at the University of Iowa. He was California State Geologist (1860-1874). His name was given by a California Geological Survey field party to Mount Whitney (1864) in east-central California, the highest summit on the U.S. mainland outside Alaska. The survey was significant for the men it trained and the methods it introduced - notably topographical mapping by triangulation. During his years in California, Whitney was active in promoting the California Academy of Science, and served as a commissioner of Yosemite Park.

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