## 6. In a class there are 32 boys and 28 girls. The average age of the boys in the class is 14 years and the average age of the girls in the class 13 years. What is the average age of the whole class (rounded to two digits after decimal) ?

## 7. The average annual income (in Rs.) of certain agricultural workers is S and that of other workers is T. The number of agricultural workers is 11 times that of other workers. Then the average monthly income (in Rs.) of all the workers is-

## 8. The average mark of student in 4 subjects is 75. If the student obtained 80 marks in the fifth subject, then the new average is-

## 9. The average of 7 consecutive numbers is 20. The largest of these numbers is-

## 10. Of four numbers whose average is 60, the first is one-fourth of the sum of the last three. The first number is -

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