There are two vessels with water. In one of them the water temperature is 20C, in the other the temperature is 100C.

There are two vessels with water. In one of them the water temperature is 20C, in the other the temperature is 100C. The water from these two vessels is drained into the third, while the water temperature is equal to 40C. Determine the ratio of the masses of water in the first and second vessels. Do not include heat loss.

Find ∆t
First ∆t = 20
Second ∆t = 60
Since temperature changes are related as 3: 1, it means that the masses are also related as 3: 1, and there is more water in the second vessel
Answer: 3 times