While studying for this quiz you realize that you still have 100 g of lukewarm coffee at 40°C left in a paper cup. When you pour 20 g of boiling water into the cup, the temperature of the resulting coffee-like mixture will be now
A. 67°C.
B. 70°C.
C. 80°C.
D. 50°C.
E. 60°C.
Answer: D
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