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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.