BRAIN TEASERS

# Calculate the number 1311

NUMBERMANIA: Calculate the number 1311 using numbers [2, 7, 5, 2, 55, 526] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #numbermania

### Did You Make A Donation?

At the United Way in a fairly small town a volunteer worker noticed that the most successful lawyer in the whole town hadn't made a contribution. This guy was making about \$600,000 a year so the volunteer thought, "Why not call him up?"
He calls up the lawyer.
"Sir, according to our research you haven't made a contribution to the United Way, would you like to do so?"
The lawyer responds, "A contribution? Does your research show that I have an invalid mother who requires expensive surgery once a year just to stay alive?"
The worker is feeling a bit embarrassed and says, "Well, no sir, I'm..."
"Does your research show that my sister's husband was killed in a car accident? She has three kids and no means of support!"
The worker is feeling quite embarrassed at this point. "I'm terribly sorry..."
"Does your research show that my brother broke his neck on the job and now requires a full time nurse to have any kind of normal life?"
The worker is completely humiliated at this point. "I am sorry sir, please forgive me..."
"The gall of you people! I don't give them anything, so why should I give it to you!"
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### Louis-Paul Cailletet

Born 21 Sep 1832; died 5 Jan 1913 at age 80.French physicist and iron master noted for his work on liquefaction of gases. Working at his father's metallurgy business, he investigated the permeability of iron to hydrogen and other gases, accounting for the unpredictable behaviour of some irons in terms of an excess of dissolved gases. In 1870, he began carefully measuring whether real gases deviate from "ideal" gas law behaviour. From this grew an interest in the liquefaction of gases. He used the Joule-Thomson effect - compressing a gas whilst cooling it, then allowing its rapid expansion to cool it still further - and in 1877-78, was first to produce droplets of liquid oxygen, hydrogen, nitrogen, carbon monoxide, nitrogen dioxide and acetylene. He also invented the altimeter and the high-pressure manometer.Image: Cailletet's liquefier.
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