If x, y, z are in arithmetic progression and a is the arithmetic mean of x and y and b is the arithmetic mean of y and z, then prove that y is the arithmetic mean of a and b.

If 'a' is the Arithmetic mean of b and c, 'b' is the Geometric mean of c and a, then prove that 'c' is the Harmonic mean of a and b.

If x,y,z are in A.P.and A1 is the arithmetic mean of x,y and A2 is the arithmetic mean of y,z then prove that the arithmetic mean of A1 and A2 isy

If ‘a', is the Arithmetic mean of b and c, 'b', is the Geometric mean of c and a, then prove that 'c' is the Harmonic mean of a and b.

The arithmetic mean (average) of m and n is 50, and the arithmetic mean of p and q is 70. What is the arithmetic mean of m, n, p and q?

If the arithmetic Mean of 8 and 'x' is 20 ,then find 'x' ?

Let x,y,z be different integers less than or equal to 14. The arithmetic mean of x and y is 10 and the geometric mean of x and z is 2 sqrt(21) then harmonic mean of y and z is equal to

Sum of 'n' arithmetic means between a and b is