Question

A 30.0 g sample of water at 5°C is mixed with 50.0 g water at 65°C in an insulated container. Find the final

temperature of the mixture. (Cwater = 4.18 J/g·°C)
PLS HELP 50 POINTSSSS

Answer 1

30(5) + 50(65) = 3400
30 + 50 = 80
3400/80 = 42.5

42.5 C

This is intuitively what it should be in my mind, I don't know any other way to solve it.