Using percentage concept, 7.5 liters of salt water must be evaporated from 60 liters of a 28% salt solution so that the remaining solution contains 32% salt.
Percentage is defined as a given part or amount in every hundred.
Let x liters of salt water must be evaporated.
Remaining salt water = (60 - x) liters
Salt content in 28% salt solution of 60 liters = 28*60/100 = 16.8
Salt content remains same in new solution as well.
[tex](32/100)*(60 - x) = 16.8\\x= 7.5[/tex]
7.5 liters of salt water must be evaporated.
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