61.
The average of the two-digit numbers, which remain the same when the digits interchange their positions, is-

62.
The average of a non-zero number and its square is 5 times the number. The number is-

63.
The average age of a cricket team of 11 players is the same as it was 3 years back because 3 of the players whose current average age of 33 years are replaced by 3 youngsters. The average age of the new comers is :

64.
The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is ?

65.
If the average weight of 6 students is 50 kg. If two student of average weight of 51 kg are added and two other students of average weight of 55 kg are also added then the average weight of all the students is :

66.
The average of the squares of first ten natural numbers is-

67.
The average of 11 results is 50. If the average of the first six results is 49 and that of the last six is 52, the sixth number is -

68.
A man bought 13 articles at Rs. 70 each, 15 at Rs. 60 each and 12 at Rs. 65 each. The average price per article is -

69.
The average salary, per head, of all the workers of an institution is Rs. 60. The average salary of 12 officers is Rs. 400; the average salary, per head, of the rest is Rs. 56. The total number of workers in the institution is -

70.
The average of the three numbers x, y and z is 45. x is greater than the average of y and z by 9. The average of y and z is greater than y by 2. Then the difference of x and z is :

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