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The arithmetic mean of the scores of a group of students in a test was 52. If 20% of them secured a mean score of 80 and 25% a mean …

There were 35 students in a hostel. If the number of students increase by 7, the expenses of the mess increase by Rs 42 per day while the average expenditure …

A batsman in his 17th innings makes a score of 85, and thereby increases his average by 3. What is his average after 17 innings?

The average age of a family of six members is 22 years. If the age of the youngest member is seven years, then what was the average age of the …

The average of 11 results is 50. If the average of the first six results is 49 and that of last six is 52, what is the sixth result?

The average of marks obtained by 120 candidates in a certain examination is 35. If the average marks of those who passed is 39 and that of those who failed …

The average age of 30 boys of a class is equal to 14 years. When the age of the class teacher is included, the average becomes 15 years. What is …

The average price of 10 books is Rs. 12 while the average price of 8 of these books is Rs. 11.75. Of the remaining two books, if the price of …

The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. …

Of the four numbers, the first is twice the second, the second is one-third of the third and the third is four times the fourth. The average of the numbers …