Physics question involving depth of oil... Pleaaaaaase help meeee :s?

Question

A 2.3 cm thick bar of soap is floating on a water surface so that 1.6 cm of the bar is underwater. Bath oil of specific gravity 0.40 is poured into the water and floats on top of it. What is the depth of the oil layer when the top of the soap is just level with the upper surface of the oil?_______cm

Answer 1

1.6*1 = 2.3*s.g.
s.g. = 0.69565,
(2.3 - h) + 0.4h = 2.3*0.69565 = 1.6
-0.6h = 1.6 - 2.3
h = 1.16667 cm ≈ 1.2 cm