Calculate the number 2928
[987] Calculate the number 2928 - NUMBERMANIA: Calculate the number 2928 using numbers [6, 3, 1, 5, 21, 928] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 30 - The first user who solved this task is Sanja Šabović
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Calculate the number 2928

NUMBERMANIA: Calculate the number 2928 using numbers [6, 3, 1, 5, 21, 928] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 30
The first user who solved this task is Sanja Šabović.
#brainteasers #math #numbermania
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There was an elderly widow who...

There was an elderly widow who lived in a large mansion. She was feeling generous when it came to Thanksgiving, so she called up the local military base, and asked to speak with the lieutenant.
"Please send up four nice young men to eat dinner here on Thanksgiving, but please, don't send any Jews. Please, no Jews."
The lieutenant replied, "No problem ma'am, and I am sure I speak for the army when I say we all appreciate your kindness."
Well, Thanksgiving rolled around, and the widow went to answer the door when it rang. She was surprised to see four black recruits. "But... But... There must be some mistake," she stammered.
One of them replied, "No ma'am, Lieutenant Goldstein doesn't make mistakes."
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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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