Question

What would be the final temperature of a mixture of 50 g of water at 20C temperature and 50 g of water at 40C tempeature?

Answer 1

Let the final temperature be T.

$50(T-20) = 50(40-T)\\ \\T-20 = 40-T\\ \\2T = 40+20\\ \\T = \frac{60}{2}=30^o\ C$