SOLUTION: John has 20 grams of a 20% of salt solution. How much salt should he add to make it a 25% solution?

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Question 1157357: John has 20 grams of a 20% of salt solution. How much salt should he add to make it a 25% solution?
Answer by VFBundy(438) About Me  (Show Source):
You can put this solution on YOUR website!
%280.20%2820%29+%2B+x%29%2F%2820+%2B+x%29+=+0.25

%284+%2B+x%29%2F%2820+%2B+x%29+=+0.25

4 + x = 0.25(20 + x)

4 + x = 5 + 0.25x

0.75x = 1

x = 1.33 g