If the average of x, y, and z is 12, what is the average of 3x, 3y, and 3z?

The averge of x and 3y is 12, the average of 2x and 3z is 21. What is the average of x,y and z ?

The average of w, x, y, and z is 31. If the average of w and y is 24, what is the average of x and z?

If the average of x, y, and z is 32 and the average of y and z is 27. What is the average of x and 2x?

If x is the average (arithmetic mean) of m and 9, y is the average of 2m and 15, and z is the average of 3m and 18, what is the average of x, y, and z in terms of m ?

The average of x, y and z is 8 and the average age of y and z is 4. What is the value of x?

If the average of x and y is 50, and the aveage of y and z is 80, what is the value of z-x ?

The average of x, y and z is 45. x is as much more than the average as y is less than the average. Find the value of z.