You put an 8 cm3 block of ice (the ice is at 0 oC) into your 20 oCliter Coke (similar heat capacity as water). All of the ice melts and resulting fluid comes to equilibrium with no heat loss. What is the temperature of the fluid?
Now you fill 1/4 of your 1 liter glass with ice and the rest by Coke at 20oC. Does all the ice melt? If so, what temperature is the resulting fluid? If not, how much ice is left?