Question

200 grams of water originally at 75 degrees is mixed with 100 grams of water originally at 25 degrees. What will be the temperature a few minutes after the water is mixed?

A. 15 degrees
B. 62 degrees
C. 100 degrees
D. 10 degrees ​

Answer 1

B. 62 degrees.

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After the two different volumes of water are mixed, the final temperature of the mixture will be the average of the two initial temperatures. This can be calculated by adding the initial temperatures together and then dividing by two. In this case, that would be (75 + 25) / 2 = 50. Since the total mass of the water is 300 grams, the temperature after mixing will be 50 * (200/300) = 66.7, rounded to the nearest degree to 62 degrees.