SOLUTION: 100 L of water contains 40% salt. How much water should be added to make it a 30% solution of salt?

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Question 954378: 100 L of water contains 40% salt. How much water should be added to make it a 30% solution of salt?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
100 L of water contains 40% salt.
How much water should be added to make it a 30% solution of salt?
:
let w = amt of water required to do this
.40(100) = .30(w+100)
40 = .3w + 30
40 - 30 = .3w
10 = .3w
w = 10/.3
w = 331%2F3 L of water