Calculate the number 1564
[2364] Calculate the number 1564 - NUMBERMANIA: Calculate the number 1564 using numbers [8, 4, 5, 1, 91, 717] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 28 - The first user who solved this task is Erkain Mahajanian
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Calculate the number 1564

NUMBERMANIA: Calculate the number 1564 using numbers [8, 4, 5, 1, 91, 717] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 28
The first user who solved this task is Erkain Mahajanian.
#brainteasers #math #numbermania
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Don't marry Miss Green

I said to my father: "Dad, I want to get married."

He said: "Alright son, who do you want to marry?"

I said: "I'd like to marry Miss Green".

He said: "You can't".

I said: "Why not?"

He said: "She's your half-sister. When I was a lad I had a bike and I got around a bit."

I said: "Alright, I'll marry Miss White."

He said: "You can't, she's your half-sister. Forget about it."

Well, I was a bit despondent and I walked around and my mum said to me: "What's wrong with you?"

I said: "Well, I said to Dad I wanted to marry Miss Green and he said I couldn't because she's my half-sister. I said, "All right, I'll marry Miss White."

He said: 'You can't, she's your half-sister."

She said: "Look, you go and marry which one you like. He's not your father anyway!"

Max Miller (1894-1963)

Picture: REX Features

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Flotation process patent

In 1898, English brothers Alexander and Francis El applied for a British patent (No. 21,948) for their flotation process to separate valuable ore, such as copper, from the gangue (worthless rock) with which it is associated when mined. It was the first practical equipment to extract metals from low-content ore. Pulverized ore is mixed with water and brought into contact with thick oil. The oil entraps the metallic constituents, which are afterwards separated, and gangue passed away with the water. Today, flotation methods remain vital in the mining industry, processing millions of tons of ores each year.
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