Average of four numbers is 215. The ratio of first to second number is 4:7, the ratio of second to third number is 9:8 and the ratio of fourth to third ...
The average number of novels on historical, thriller and fantasy in a library is 195, and the average number of novels on historical and fantasy is 150....
The average age of a group of 20 students is 25 years. Two persons of age 40 years and 30 years, left the group and 2 persons of age 60 years and...
The average age of a class of 25 girls is 16 years. If 5 new girls having average age of 10 years join the class, then the average age of the class beco...
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...
In a school club, the ratio of juniors to seniors is 3:2. The average score of all seniors is (x − 2) and the average score of all members is (x + 4)....
The average number of taxis of three colours (black, white and yellow) in a taxi stand is 123. The number of black taxis is 40 more than that of yellow ...
The average of 9 numbers is 25. If one more number is added, the new average becomes 26. Find the number added.
The average age of a class was 16 years. 8 new students with an average age of 12 years joined the class. So, the average age of class decreased...
The average of two numbers ‘X’ and ‘Y’ is 400 such that they are in the ratio 3:5 respectively. Another number ‘Z’ is 80 more than ‘Y’ a...
