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Perform this calculation in ...

Perform this calculation in your head, mentally adding the numbers as quickly as you can. Start with 1000 and add 40. Now add 1000. Add 30 to that, then add another 1000. Now add 20 to that result. Add another 1000 and finally, add 10 to that. What is the total?

Correct answers: 86

The first user who solved this task is Sanja Šabović.

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The Conscientious Ransomer

I got attacked by ransomware and was asked for money...
I sent them my pay stub...
Not only did they immediately remove the malware from my system, but they also put some money into my account.

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Thomas Andrews

Born 19 Dec 1813; died 26 Nov 1885 at age 71. Irish physical chemist who demonstrated the continuity of the gaseous and liquid states whereby during changes between the two states, physical properties display no abrupt changes. He discovered the critical temperature for carbon dioxide (1861), above which the gas cannot be liquefied by pressure alone. He wrote: We may yet live to see...such bodies as oxygen and hydrogen in the liquid, perhaps even in the solid state. He accurately measured heats of neutralisation, formation and reaction; and latent heats of evaporation. Andrews was the first to use a "bomb calorimeter" - a strong, sealed, metal vessel for measuring heat of combustion. He studied ozone, and proved that is an allotrope - or altered form - of oxygen.«

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