SOLUTION: a solution contains 5% salt. How much water should be added to 20ml of the solution to make 1% solution?

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Question 416872: a solution contains 5% salt. How much water should be added to 20ml of the solution to make 1% solution?
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

5% * 20 = 5/100 * 20 = 1
(x+ 20) * 1/100 = 1
x = 100-20 = 80

so, 80 ml of water is needed......