The average of a series of 30 numbers is 70. The difference between the largest number and the smallest number is 140. If the largest and the smallest n...
Out of 6 numbers, the average of first 5 is 19 and last 5 is 20. If the last number is 21. Find the first number?
The average weight of x students in a class increases by 1.5 kg when a new student of weight 69 kg joins the class. If instead, t...
In a workshop of 50 participants, the average age is 40 years. One participant aged 38 leaves, and 5 new participants with an average age of 44 join. Wh...
Average run scored by a batsman in first ‘x’ matches is 20. In next 5 matches he scored runs with an average of 60 so that his overall average incre...
The average age of 33 children and their teacher's age are 25 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
The cost of running a mini train is partly fixed and partly variable. When 50 tickets are sold, the average cost per ticket is Rs. 45. When 70 tickets a...
The average of 10 observations is 60. It was realized later that an observation was misread as 39 in place of 93. The correct average is:
The average expenditure of a man for the first 4 month is Rs.4000 and for the next 8 months is Rs.6000. If he saves 11000 in that year then find his ave...
There are three numbers 'a', 'b' and 'c' such that average of 'a' and 'b' is 14, average of 'b' and 'c' is 16 and average of 'a' and 'c' is 30. Find the...
