Calculate the number 6650
[284] Calculate the number 6650 - NUMBERMANIA: Calculate the number 6650 using numbers [7, 7, 4, 3, 21, 922] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 40 - The first user who solved this task is Sanja Šabović
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Calculate the number 6650

NUMBERMANIA: Calculate the number 6650 using numbers [7, 7, 4, 3, 21, 922] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 40
The first user who solved this task is Sanja Šabović.
#brainteasers #math #numbermania
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A Million Dollars

A man was taking it easy, lying on the grass and looking up at the clouds. He was identifying shapes when he decided to talk to GOD.
"GOD", he said, "How long is a million years?"
GOD answered, "In my frame of reference, it's about a minute."
The man asked, "GOD, how much is a million dollars?"
GOD answered, "To Me, it's a dime."
The man then asked, "GOD, can I have a dime?"
GOD said, "In a minute."    

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Ultrasonic alarm

In 1953, the first U.S. patent for a burglar alarm operated by ultrasonic sound was issued to Samuel Bagno of New York City (No. 2,655,645) on a system for movement detection in a confined space by intruders or fire. It was manufactured as the Alertronic and first sold in Jun 1950. A sound source produced waves of 19,000 hertz, a frequency too high for normal human hearing. An intruder could be detected by the alarm by a difference in frequency of the reflected waves from the moving body (the Doppler effect). The device would then sound an alarm.
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