List of top Arithmetic and Mental Ability Questions on Average

11 natural numbers are listed sequentially. The mean of the 11 numbers is 50. If the average of first 6 numbers is 49 and that of the last 6 numbers is 52, then the sixth number is

The arithmetic mean of 10 numbers is 65. If one number is removed and 25 is included in the list. The new arithmetic mean is 60. The removed number is

The average marks of 15 students in a subject is 65. If another student has scored 97 marks in the same subject, then the average marks of the 16 students is: