SOLUTION: How much water must be evaporated from 500 grams of a 10% salt solution to obtain a 15% salt solution?

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Question 337983: How much water must be evaporated from 500 grams of a 10% salt solution
to obtain a 15% salt solution?
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 500 grams of a 10% salt solution
to obtain a 15% salt solution?
;
Let w = amt of water to be evaporated
:
Write an amt of salt equation (the amt remains the same, only the % changes)
.10(500) = .15(500-w)
50 = 75 - .15w
.15w = 75 - 50
w = 25%2F.15
w = 1662%2F3 grams to be evaporated
:
:
Check: That leaves: 500 - 166.67 = 333.33 gram solution after evaporation
.10(500) = .15(333.33)
50 = 50; confirms our answer