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

## 57. 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 -

## 58. 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 -

## 59. 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 -

## 60. 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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