Arithmetic Questions And Answers :: Average: part1

6.The average of five results is 46 and that of the first four is 45. The fifth result is :

7.The average of 25 results is 18; that of first twelve is 14 and of last twelve is 17. Thirteenth result is :

8.A ship sails out to a mark at the rate of 15 km/ph and sails back at the rate of 10 kmph. The average rate of sailing is :

9.The average score of a cricketer in 2 matches is 27 and that in 3 others is 32. Then his average score in 5 matches is :

10.The average age of 30 students in a class is 12 years. The average age of a group of 5 of the students is 10 years and that of another group of 5 of them is 14 years. The average age of the remaining students is :