Find the real solutions to x, y & z if : log10(2000xy) - log10x log10y = 4, log10(2yz) - log10y log10z = 1, log10zx - log10z log10x = 0.

1) None of these
2) (1, 5, 1), (100, 20, 100)
3) (10, 4, 3), (100, 20, 100)
4) (1, 5, 1), (120, 25, 120)