Verified answer

It is Jupiter's mass divided by the sum of its Moons' masses (Io, Europa, Ganymede, Callisto).

You can find their masses on Wikipedia, it's not that hard.

The total mass of the Galilean moons is about 5.35 times the mass of our moon and the mass of Jupiter is about 25,750 times the mass of our moon, so the ratio between Jupiter and the total mass of the Galilean moons is 25750/(107/20).

Well not sure actually , but i can tell you this , jupiter is a gas planet and has a surface the size of the earth if not even less .

Almost nill in difference

.

Jupiter is a gas giant

.