Sir, why it is 1:9 of floating ice to under water ice.?

i got sir,11 percent is visible part of ice,. what is 1:9 in my question?

In general, when a liquid changes to solid, it contracts because its molecules come closer to each other. As a result of this, the volume of the substance decreases or its density increases. Hence a substance becomes heavier in ‘solid state than in the liquid, state. But water is a peculiar liquid. When it becomes ice, instead of contracting, it expands. The volume of ice becomes more than that of the water. The effect of the increase in the volume of ice is that its density becomes nine-tenth of water, that is, ice becomes lighter than water. So we get about 10 liters of ice made out of 9 liters of water. And as you know, ‘liter’ is a measure of volume. That is why nearly nine-tenth of ice is submerged in water, while only one-tenth is above water. The ice under water (9/10 of the whole) displaces water whose weight equals that of the whole ice. This law of floatation is derived from Archimedes principle. This also explains how the maximum portion of the giant icebergs remains sub-merged in water while only a tip (1/10 part) is above water.

sir 1:9 or 10:90 , 10th part of of ice is outside and 90 part inside water.?

Yes, both are equivalent

then how it is 0.11 or 11 percent as per my question.

It should be 0.10 or 10%. There might be some discrepancies in answer.

ok sir ty so much