Problem D5:
You have m_{0} grams of water at an initial temperature of n_{3} Deg C.
You also have m_{0}/n_{1} grams of ice at an initial temperature of
0 Deg C. Now, you place the ice into the water. The ice melts and the whole
system becomes water at an equilibrium temperature of n_{2} Deg C.
What was the initial temperature n_{3} of the water? Take the specific heat
capacity of water to be 1 cal/Deg, and the latent heat of fusion of ice to be
80 cal. Note that n_{2} and n_{3} are in units of Deg C, and n_{1}
is unitless.

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