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Calculate the number 6724

NUMBERMANIA: Calculate the number 6724 using numbers [1, 7, 4, 8, 52, 789] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 24

The first user who solved this task is Djordje Timotijevic.

#brainteasers #math #numbermania

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Corkscrew

In 1860, M L. Byrn of New York City, N.Y., was issued a patent for an improved corkscrew - a “covered gimlet screw with a ‘T’ handle” (No. 27,615). The inventor claimed the design would provide greater strength and durability and which could be manufactured at less cost than prior construction methods using a spiral twist of steel wire that gradually tapered from the handle to the point. Byrn claimed the gimlet-type screw with wider threads would also be strong enough to “remove a bung of the hardest wood from a barel or hogshead.”

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