When you float an ice cube in water, you notice that 90% of it is submerged beneath the surface. now suppose you put the same ice cube in a glass of some liquid whose density is less than that of water.

how much of the ice cube will be submerged below the surface of this liquid?

more than 90%

Explanation:

In the unknown liquid the buoyant force and weight relation is

It can be seen that if the density decreases the buoyant force decreases.

If the object is already 90% submerged in water then, if the other liquid has density less than that of water the object will be submerged more than 90%.