Question

a ship made of the metal floats but coin sinks why​

Answer 1

Answer:       A ship floats because its average density is relatively small. ... Divide its total mass (its own mass plus that of its contents) by its volume and you get its average density. That's less than the density of a solid metal box or a metal box filled with water, and that's why the ship floats.

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Answer 2

a ship made of the metal floats but coin sinks why​

Answer:

The air that is inside a ship is much less dense than water. That's what keeps it floating!

but the average density of a coin is much more than water. That's what makes it sink

and a new question comes how to make a boat float?

The average density of the total volume of the ship and everything inside of it (including the air) must be less than the same volume of the Water it is in