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Calculate the number 250

NUMBERMANIA: Calculate the number 250 using numbers [2, 5, 1, 7, 57, 138] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 37

The first user who solved this task is Sanja Šabović.

#brainteasers #math #numbermania

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How do you get down off an elephant?

How do you get down off an elephant?
You don't, you get down off a goose.

Why are elephants always so broke?
They work for peanuts.

What do you call an elephant that doesn't matter?
Irrelephant.

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Ernest Solvay

Died 26 May 1922 at age 84 (born 16 Apr 1838).Belgian industrial chemist who invented the Solvay Process (1863), a commercially viable ammonia-soda process for producing soda ash (sodium carbonate), widely used in the manufacture of such products as glass and soap. Although a half-century before, A.J. Fresnel had shown (1811) that sodium bicarbonate could be precipitated from a salt solution containing ammonium bicarbonate, many engineering obstacles had to be overcome. Solvay's successful design used an 80 foot tall high-efficiency carbonating tower in which ammoniated brine trickled down from above and carbon dioxide rose from the bottom. Plates and bubble caps helped create a larger surface over which the two could react forming sodium bicarbonate.

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