You drop an ice cube into an insulated container full of water and wait for the ice cube to completely melt. The ice cub

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You drop an ice cube into an insulated container full of water
and wait for the ice cube to completely melt. The ice cube
initially has a mass of 80.0 g and a temperature of
0°C. The water (before the ice cube is added) has a mass
of 780 g and an initial temperature of 30.0°C.
What is the final temperature (in °C) of the mixture? (Assume
no energy is lost to the walls of the container, or to the
environment.)
°C