Zoe has 25 grams of water (c = 4.186 joules/g°C) at 10°C, which she mixes with 12 grams of water at 30°C. Assume that no heat is lost to the surroundings. What is the final temperature of the two liquids?

a) -47°C
b) -8°C
c) 3°C
d) 16°C