A, B, C are three numbers. Let
@ (A, B) = average of A and B,
/ (A, B) = product of A and B, and
X (A, B) = the result of dividing A by
Average of A, B and C is given by
@(/(@(/(B, A), 2), C), 3)
X(@(/(@(B, A), 3), C), 2)
/(@(X(@(B, A), 2), C), 3)
/(X(@(/(@(B, A), 2), C), 3), 2)