Calculate the number 2540
[5375] Calculate the number 2540 - NUMBERMANIA: Calculate the number 2540 using numbers [6, 4, 9, 6, 38, 557] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 17 - The first user who solved this task is Djordje Timotijevic
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Calculate the number 2540

NUMBERMANIA: Calculate the number 2540 using numbers [6, 4, 9, 6, 38, 557] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 17
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #numbermania
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A gang of pirates find themselves shipwrecked on the beach

Luckily there's a harbor near by and the captain heads in to barter for goods.

Naturally the captain seeks out the first merchant who is selling booze and requests his finest bottle of rum.

Upon returning the crew is aghast. "All you came back with is a lousy bottle of rum"? Aye boys the merchant says to me this here's a magic bottle of rum. No matter how much yee drink it never goes dry. "You fool!!! He hoodwinked you. There's no such as a magic bottle of rum"! Ah well, no matter, alls I traded him was a ship that'll never sink.

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DuPrene

In 1931, The DuPont company, of Wilmington, Delaware, announced the first synthetic rubber. It was known as DuPrene, and from 1936 as Neoprene. Many scientists were trying to make natural rubber in the 1920s and 30s. One of the Wallace Carothers team, Gerard Berchet, had left a sample of monovinylacetylene in a jar with hydrochloric acid (HCl) for about five weeks. Then on 17 Apr 1930, coworker Arnold M. Collins happened to look in that jar and found a rubbery white material. The HCl had reacted with the vinylacetylene, making chloroprene, which then polymerized to become polychloroprene. The new rubber was expensive, but resisted oil and gasoline, which natural rubber didn't. It was the first good synthetic rubber.[Image: Wallace Carothers showing the new DuPrene product]
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