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1- Find the average of all the prime number between 30 and 50?
2- 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. Find the age of the class teacher?
3- The Average of marks obtained by 120 candidates in a certain examination is 35. If the average marks of passed candidates is 39 and that of failed candidates is 15, what is the number of candidates who passed the examination?
4- The average of 11 results is 50. If the average of first 6 results is 49 and that of last 6is 52, find the sixth result?
5- The average age of a family of 6 members is 22 years. If the age of the  youngest member be 7 years, then what was the average age of the family at the birth of the youngest member?
6- 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?
7- A cricketer has completed 10 innings and his average is 21.5 runs. How many runs must he make in his next innings so as to raise his average to 24?
8- 1/3 rd of certain journey is covered at the rate of 25 km/hr, 1/4 th at the rate of 30 km/hr and rest at 50 km/hr. Find the averae speed for the whole journey?
9- The average salary of the entire staff in a office is Rs 120 per month. The average salary of officers is Rs 460 and that of non officer is Rs 110. If the number of officer is 15, then find the number of non-officer in the office?
10- 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 per head diminishes by Rs 1. Find the original expenditure of the mess?