ANSWER
4.2kg
EXPLANATION
We want to convert the weight of Eliot's backpack, which weighs 4,200 grams into kilograms.
We know that:
1,000 grams =1kg
Therefore :
[tex] 4200g = \frac{4200}{1000} = 4.2kg[/tex]
Therefore the weight of Elliot backpack in kilograms is 4.2kg