The average (arithmetic mean) of a set of mean daily temperatures

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The average (arithmetic mean) of a set of mean daily temperatures for x days is 70 degrees. When a mean daily temperature of 75 degrees is added to this set, the average increases to 71 degrees.

Quantity A

Quantity B

A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.

答案：B

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