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Calculate the number 120

Calculate the number 120 using numbers [4, 3, 9, 3, 15, 75] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 69

The first user who solved this task is Sanja Šabović.

#brainteasers #math

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Detecting Indian flatbread

I say my secret superpower is detecting Indian flatbread in any given room.

My friends all say it's naan-sense.

Author: woodybuzzes reddit user.

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Rotoblator

In 1991, the "Rotoblator," an artery cleaning tool, was announced by Dr. Maurice Buchbinder at the annual meeting of the American College of Cardiology. Using a diamond head rotating at 200,000 rpm on a small shaft (only nine thousandths of an inch) inserted in a clogged artery, obstructions could be successfully removed in about 95% of cases. This procedure is particularly useful for hardened, calcified blockages. The blockage is pulverized to particles smaller than the size of a red blood cell - particles that harmlessly exit the bloodstream. The device, dubbed a Rotablator, won Food and Drug Administration approval in 1993, and is manufactured by Heart Technology Inc. of Bellevue, Wash.

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