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While studying for this quiz you realize that you still have 100 g of lukewarm coffee...

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 50 g of boiling water into the cup, the temperature of the resulting coffee-like mixture will be now

A.

50°C.

B.

60°C.

C.

67°C.

D.

70°C.

E.

80°C.

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