单项选择题

The median of 10，15，x and y is 18.5，and x＜y．（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.

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单项选择题

The geometric mean of any two positive numbers x and（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.

单项选择题

The average(arithmetic mean)of 3different positive integers is equal to the average of 5、7、8、9 and 11．（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D. if the relationship cannot be determined from the information given.