Water temperatures

To 25 liters of water at 50 °C we add 15 liters of water at a different temperature. How many °C should the water be colder than 50 °C so that 40 liters of the water obtained has a temperature 42.5 °C?

Correct result:

x =  20 l


25•50 +15•(50-x)=40•42.5

15x = 300

x = 20

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