Jika 2x = 15 dan 15y = 32, maka xy =

2x = 15
  x = 15:2
  x = 7.5

15y = 32
    y = 32:15
    y = 2.13

xy =  15.975

2x=15 ---->x=15/2
15y=32----->y=32/15

lnjut  xy=15/2 x 32/15 =480/30=32/2.