ANSWER
1.015 L = 1,015 mL
EXPLANATION
To solve this we have to keep the relation 1 L = 1000mL in mind.
So if the soda bottle contains 2L, that is the same as 2000 mL. When we have to subtract two amounts (or add them) we always have to put them in the same units, so we either have to use them all in milliliters or in liters. Since the amount of soda they drank is less than 1000mL, it is better if we use milliliters:
[tex]2000mL-985mL=1015mL[/tex]The amount of soda left is 1015mL or, what is the same, 1.015 L
