SOLUTION: An amount of distilled water is added to 2 quarts of 25% pure disinfectant to produce a 20% mixture. Determine amt. of water added. Let x = amt. added. 25% means pure means

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Question 1106970: An amount of distilled water is added to 2 quarts of 25% pure disinfectant to produce a 20% mixture. Determine amt. of water added.
Let x = amt. added.
25% means pure means 25% of any amt. would be pure.

25% of 2 quarts = .5 qts.
.25(2) + x = .20(.25 + x)
Not sure. Non-homework.
Found 2 solutions by josgarithmetic, josmiceli:
Answer by josgarithmetic(39614) About Me  (Show Source):
You can put this solution on YOUR website!
%282%2A25%29%2F%282%2Bx%29=20

The addition of water changes the concentration but not the amount of disinfectant.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
[ qts of pure disinfectant ] / [ total qts of mixture = [ .2 qts ]
Let +x+ = qts of distilled water added
+.25%2A2+%2F+%28+2+%2B+x+%29+=+.2+
+.5+=+.2%2A%28+2+%2B+x+%29+
+.5+=+.4+%2B+.2x+
+.2x+=+.1+
+x+=+.5+
.5 qts of water are needed
check the math