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Insulation of wall

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Calculator allows you to calculate the amount of insulation panels needed to cover the walls of the building using the "light wet" or "dry light" methods.
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Whether a number is prime

Checks the user number is a prime number.
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Rainwater tank

The calculator calculates the amount of collected rainwater from the roof of the given dimensions. Long description      
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Statistical calculator

Calculator allows to determine the basic statistical parameters such as standard deviation, arithmetic mean, variance, and median for the values.
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Feels like

Calculator on the basis of the given air temperature and wind speed are calculated wind-chill effect.