How much milk at 10 degrees would need to be added to 250 ml of coffee at 95 degrees celsius to cool the coffee to 90 degrees celsius

Answer 1

[mass milk x specific heat milk x (Tfinal-Tinitial)] + [mass coffee x specific heat coffee x (Tfinal-Tinitial)] = 0
Tfinal = 90
Tinitial = 95
I assume specific heat milk and coffee to be the same as specific heat H2O.