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01.  The average salary of employees of 2 groups a and b in an organisation is rs 4,000. The average salary of the group a employees is rs 4,800. The average salary of the group b employees is rs 3,000. If there are 10 more employees in a than b, find the number of group a employees.  

02.  Average of 11 numbers is 50. If the average of the first six numbers is 49 and that of last six is 52, what is the sixth number?  

03.  A trader mixes 2 varieties of rice, one costing rs 15 per kg and the other costing rs 25 per kg, so that by selling the mixture at rs 30 per kg he makes a profit. In what ratio he mixed them?  

04.  A vessel has 20 lts of a mixture of milk and water having 60% milk. Five litres of pure milk is added to the vessel. Find the percentage of milk in the new solution.  

05.  In a cricket match, 6 players had a certain average of their runs. Seventh player makes a score of 112 runs, thereby increasing the average of their runs by 10.Find the average of first 6 players.  

06.  In a class there are 90 students. 30 of them are boys. Their average mark in a test is 75. The average mark of the girls in the test is 90. Find the average mark of the class in the test.  

07.  There are 40 students in a class. Out of these students, one student whose weight is 100 kg goes away and at the same time a new student gets admitted into the class. Thus the average weight of the students increases by Â¼ kg. find the weight of the new student.  

08.  There are 50 boys in a class whose average age is 12 years. There are 40 boys in another class whose average age is 15 years. What is the average age of both the classes taken together?  

09.  In what proportion, can 3 varieties of sugar priced at rs 10, 12 and 18 per kg, be mixed so that the price of the mixture is rs 14 per kg?  

10.  30 horses were purchased for Rs. 12000. The average cost of 12 horses out of them is Rs 250. Find the average cost of the remaining horses.  
