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i think i am using the wrong formula 1. - (20 points) 0.02 kg of milk at 20 .C are in contact with 0.09 kg

i think i am using the wrong formula

1. - (20 points) 0.02 kg of milk at 20 .C are in contact with 0.09 kg of coffee at 50 C. Find the final equilibrium temperature of the mix. (Specific heat of milk = 3.93 kJ/kg.C and specific heat of coffee = 4.19 kJ/kg.C)

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