SOLUTION: how many millilitres of vinegar must be added to 20 millilitres of a 10%-vinegar solution to make it a 25%-vinegar solution?

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Question 852033:
how many millilitres of vinegar must be added to 20 millilitres of a 10%-vinegar solution to make it a 25%-vinegar solution?
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
X+.10*20=.25(X+20)
X+2=.25X+5
X-.25X=5-2
.75X=3
X=3/.75
X=4 ML. 0F PURE VINEGAR ARE REQUIRED.
PROOF:
4+.10*20=.25(4+20)
4+2=.25*24
6=6