Question

If 1.5 gals of 70 degree water is mixed with .25 gals of 32 degree water what would the temprature be?

Answer 1

There is 6 times as much warm water as cold water. That means the drop in temperature of the hot water will be 1/6 the temperature rise of the cold water, at equilibrium. The initial temperature difference is 38 F.
(1/7)*38 = 5.4 degrees
= temperature drop of the hot water.
Final T = 64.6 F