Water mixing

There are 5 liters of water at 75°C in the pot, how much water at 10°C do we have to add to the resulting temperature of 55°C?

Correct answer:

x =  2.2222 l

Step-by-step explanation:

5•75 + 10•x = 55•(5+x)

45x = 100

x = 20/9 ≈ 2.222222

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