SOLUTION: A 280 mL solution is 20% salt. How much water should be added to make the solution 14% salt?

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Question 321728: A 280 mL solution is 20% salt. How much water should be added to make the solution 14% salt?
Found 2 solutions by Fombitz, modi.kk91:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the number of milliliters of 0% salt solution (pure water) added.
20%28280%29%2B0%28A%29=14%28280%2BA%29
5600=3920%2B14A
14A=1680
highlight%28A=120%29
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Add 120 ml of pure water.

Answer by modi.kk91(20) About Me  (Show Source):
You can put this solution on YOUR website!
here given 20%salt of 280 ml

then salt=20*280/100=56 salt

let added water be x

then

56/280+x=14/100
1680=14x

ans x=1680/40===120