SOLUTION: how much water must be evaporated from a 10 kg solution which has 4% salt to make a solurtion of 10% salt?

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Question 150407: how much water must be evaporated from a 10 kg solution which has 4% salt to make a solurtion of 10% salt?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
how much water must be evaporated from a 10 kg solution which has 4% salt to make a solution of 10% salt?
:
Let x = amt of water evaporated
:
Write an equation based on the amt of salt.
(the amt of salt does not change, only the per cent of salt changes)
:
.04(10) = .10(10-x)
.4 = 1 - .1x
.4 - 1 = -.1x
-.6 = -.1x
x = %28-.6%29%2F%28-.1%29
x = 6 liters of water evaporated
;
:
Check solution
.04(10) = .1(10-6)
.4 = .4