Linh is twelve years old. She is a student in Nguyen Hue School. The school is near her house so she goes to school by bike every morning. She has classes from 7.00 to 11.15. She has lunch at 12.00. In the afternoon, she does the housework and plays badminton. She usually does her homework in the evening. She goes to bed at 10.30. How old is Linh?