diketahui x,y dan z adalah tiga bilangan positif .jika xy=15,yz=12 dan xz=5 maka xyz

xy = 15 → y = 15/x ... (1)
yz = 12
(15/x)z = 12 → z = 4x/5 ... (2)
xz = 5
x(4x/5) = 5
4x² = 25
2x = 5
x = 5/2
y = 15/(5/2) = 6
z = 4(5/2)/5 = 2

xyz = (5/2)(6)(2) = 30