Question

who has the most water and why

Answer 1

Angel has more water because she has five hundredths. Lance only has four hundredths. If the number closest to the decimal on the right of it is higher it is a greater value

Answer 2

Angel has more water. You need to look at the number right after the period to determine whether or not the value is bigger. If the number is 5 or higher, the value is raised. If the number is 4 or lower, the value goes down. 

Or you could look at it like this:

We have .485 and .5

If we add zeros to .5, we get .500

You can subtract .485 from .500 to see if it is bigger or not.