# GMAT 考满分题库

In a certain class, x students are 10 years old, and the remaining y students are 11 years old. What is the average (arithmetic mean) age of all students in the class?
• A${x+y}\over{21}$
• B${10x+11y}\over{21}$
• C${110xy}\over{x+y}$
• D${110xy}\over{xy}$
• E${10x+11y}\over{x+y}$

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• 按热度
• 按顺序