I need help to solve this Math Problem

Question

X-Z = Y% of W    –(i)

X-W = Z% of Y    –(ii)

Y-X = Y% of (W+Z) –(iii)

If, W ≠ Z, then what % is X of (W+Y+Z) ?

Answer 1

Х = (W+ Y + Z) / 3, ~ 33% of (W+ Y + Z)

Clue: ( i ) + (ii) - (iii) = 0 at the right part.