What is the missing number?
[5108] What is the missing number? - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 45 - The first user who solved this task is Thinh Ddh
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What is the missing number?

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 45
The first user who solved this task is Thinh Ddh.
#brainteasers #math #riddles
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Fighting for Business

The shopkeeper was dismayed when a brand new business much like his own opened up next door and erected a huge sign which read BEST DEALS.
He was horrified when another competitor opened up on his right, and announced its arrival with an even larger sign, reading LOWEST PRICES.
The shopkeeper was panicked, until he got an idea. He put the biggest sign of all over his own shop-it read…
Main entrance.

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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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