Taking in account that ice cubes are made with water, both substance has the same heat propieties, so then only needs to consider mass and temperatures to reach a solution and use a weighted average of the initial temperatures,
2 ice of 20 gr. at -20ºC or 253.15º K and 205 gr of water at 25ºC or 298.15ºK,
then final temperature, Tf is:
Tf= ((2*20*253.15)+(205*298.15))/(2*20+205)=290.8ºK or 17.65ºC
The final temperature after ice melts decrease till 17.65ºC
