Calculate the number 678
[1022] Calculate the number 678 - NUMBERMANIA: Calculate the number 678 using numbers [3, 8, 9, 5, 80, 315] 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 678

NUMBERMANIA: Calculate the number 678 using numbers [3, 8, 9, 5, 80, 315] 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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Explosion

A terrifying explosion occurs in a gunpowder factory, and once all the mess has been cleared up, and inquiry begins.
One of the few survivors is pulled up to make a statement. "Okay Simpson," says the investigator, "you were near the scene, what happened?"
"Well, it's like this. Old Charley Higgins was in the mixing room, and I saw him take a cigarette out of his pocket and light up."
"He was smoking in the mixing room?" the investigator said in stunned horror, "How long had he been with the company?"
"About 20 years, sir"
"20 years in the company, then he goes and strikes a match in the mixing room, I'd have thought it would have been the last thing he'd have done."
"It was, sir."        

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Video recorder

In 1956, the first practical commercial black-and-white video recorder was demonstrated at a broadcast convention in Chicago and simultaneously in Redwood City, Ca. The VT-100 by Ampex Corporation of Redwood City was the size of a deep-freeze with an additional five 6-foot racks of circuitry. The 2-inch wide magnetic tape moved at a speed of 15 inches per second. The system had four heads on a disc rotating perpendicularly across the width of the tape, thus tracing an oblique track pattern. A single 14-inch reel could carry a 65-min. recording. The Columbia Broadcasting System purchased three of the video recorders in 1956, priced at $75,000 for each unit, and first broadcast from tape on 30 Nov 1956.
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