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Calculate the number 621

NUMBERMANIA: Calculate the number 621 using numbers [7, 5, 2, 5, 31, 138] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 11

The first user who solved this task is Nílton Corrêa de Sousa.

#brainteasers #math #numbermania

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Red crayons

You might wonder why blonde nurses bring red crayons to work.

It's in case they have to draw blood.

A comment from reddit user - Ethyques:

Any crayon would work if it's sharp enough. Otherwise it would be pointless.

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Auto AC

In 1939, the first air-conditioned automobile was exhibited by its manufacturer, Packard Motor Co. of Detroit Michigan. The public exhibition at the 40th Automobile Show in Chicago, Illinois ran between 4-12 Nov. Air in the car was cooled, dehumidified, filtered and circulated. Heat was provided for use in the winter. The refrigerating coils were located behind the rear seat in an air duct, with heating coils in another compartment of the same duct. The capacity of the unit was equivalent to 1.5 tons of ice in 24 hours when the car was driven at 60 mph. Cadillac followed in 1941. The huge evaporator left little room for luggage in the trunk, and the only way to shut it off was to stop, raise the hood, and remove the compressor belt. Cadillac followed in 1941.

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