The average of 9, 11, and 16 is equal to the average of 21, 4.6, and what number ?

The average of 8, 13, x, and y is 6. The average of 15, 9, x and x is 8. What is the value of y?

The average of a, 11, 23, 17 is 15 and the average of a,b,12, 25 is 16. The value of (a)/(b) is :

The average of 21 numbers is 12. The average of the first 11 numbers is 9 and the average of the last 11 numbers is 15. What is the value of the middle number ?

The average of 11 numbers is 10.9. If the average of the first six numbers is 10.5 and that of the last six numbers is 11.4, then the middle number is: (a) 11 (b) 11.3 (c) 11.4 (d) 11.5

The average of 11 numbers is 10.9. If the average of the first six numbers is 10.5 and that of the last six numbers is 11.4, then the middle number is :

The average of 41 numbers is 63. The average of first 21 number is 61.5 and that of last 21 numbers is 65.5. if 21^(St) number is excluded then the average of remaining numbers is:

The average of five numbers is 6 1.4 The average of first and second number is 40.5 and that of fourth and fifth number is 72. What is the third number?

The average of 61 numbers is 54 .The average of first 31 numbers is 50.6 and that of last 31 numbers is 60.4 . If the 31^(st) number is excluded ,then what is the average of the remaining numbers ?