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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The key

All the good knights were leaving for the Crusades. One knight told his best friend "My bride is without doubt one of the most beautiful women in the world. It would be a terrible waste if no man could have her. Therefore, as my best and most trusted friend, I am leaving you the key to her chastity belt to use should I not return from the Crusade in seven years."

The company of knights were only a mile or so out of town when they noticed a cloud of dust approaching. Thinking it might be an important message from the town the column halted. A horseman approached. It was the knight's best friend. He said "Hey, you gave me the wrong key!!"

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Night vision tube

In 1936, the first electron tube to enable night vision was described, in St Louis, Mo.
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