The average of 2, 7, 6 and `x` is 5 and the average of 18, 1, 6, `x` and `y` is 10. What is the value of `y` ? (a) 5 (b) 10 (c) 20 (d) 30

The mean of 2,7,6 and x is 5 and the mean of 18,1,6,x and y is 10 What is the value of y

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?

If the average of the list {5, 6, 6, 8, 9, x, y} is 6, then what is the value of x + y ?

If 3x+5y=15 and x-2y=10 , what is the value of 2x+7y ?

If 2x+y=5 and 3x-4y=2, then the value of 2xy is (a) 4 (b) 6 (c) 8 (d) 10

Find the average of all the numbers between 6 and 34 which are divisible by 5. (a) 18 (b) 20 (c) 24 (d) 30

The average of u,v,w,x,y,z is 10. What is the average of u+10 , v+20 , w+30 , x+40 , y+50 , z+60 ?

If 3x-4y+z=7; 2x-z+3y=19 ; x+2y+2z=24 , then what is the value of z ? (a) 4 (b) 5 (c) 6 (d) 8

The average of A , B and C is 18 and that of C, D and E is 12 and that of E and F is 6.5 and that of E and C is 3.5 . What is the average of A,B,C,D,E and F ?