Mix 68 l of water with a temperature of 87 °C, 17 l warm of 42 °C, and 55 l water of 50 °C.

What is the temperature of the mixed water immediately after mixing?

Correct result:

t =  67 °C


V1=68 l V2=17 l V3=55 l  t1=87t2=42t3=50 t=V1 t1+V2 t2+V3 t3V1+V2+V3=68 87+17 42+55 5068+17+55=67C

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