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

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

## 53. 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 :

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

## 55. 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 :

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