How many 250 ml bottles can be filled from 400 liters of water?

##1600## such bottles

Each liter of liquid is equivalent to ##1000## ##ml##.

Hence in each liter, we have ##1000/250=(4cancel(1000))/(1cancel(250))## or four (##4##) ##250## ##ml## bottles.

And in ##400## liter, we will have ##400xx4=1600## such bottles.