SOLUTION: how many kilograms of water must be evaporated from 40 kg of a 10% salt solution to produce a 25% salt solution?

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Question 267284: how many kilograms of water must be evaporated from 40 kg of a 10% salt solution to produce a 25% salt solution?
Answer by palanisamy(496) About Me  (Show Source):
You can put this solution on YOUR website!
Given, 40 kgs of a solution contains 10% of salt.
So, the quantity of salt in the solution = 40*(10/100)=4 kgs
Let x kgs of water be evaporated so that the new solution contains 25% salt
(40-x)*(25/100) = 4
(40-x)*(1/4) = 4
40-x = 16
-x = 16-40
-x = -24
x = 24 kgs