Mixed Water Temperature: 100ml @ 20°C & 400ml @ 40°C

[HDBG]

Homework Statement

If a beaker has 100 ml of water at 20 degrees and another one has 400ml of water at 40 degree what would the temperature be when mixed

 

[danago]

What are your thoughts on the question? Have you made an attempt?

HINT: Think about the first law of thermodynamics -- the energy transferred from the hot water will be equal to the energy transferred to the cold water. Whatever this energy is, it should cause the hot and cold water to end up at the same temperature.