2000g 75.75kg 5050g 3kg order then from smallest to gretest

Try to convert all of them, in one kind of unit, Here we will do for Kgs,
as we know, 1 kg = 1000 g
so, 2000g = 2 kg & 5050g = 5.050 Kg

Now, Arranging from smallest to greatest :
2 Kg < 3 Kg < 5.050 Kg < 75.75 Kg

In the end, you can re-replace the values, it would be:
2000 g < 3 Kg < 5050 g < 75.75 Kg

Hope this helps!