SOLUTION: How many pounds of chemical need to be added to 250 lbs of water to make a concentration of 21%

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Question 1056698: How many pounds of chemical need to be added to 250 lbs of water to make a concentration of 21%
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
How much chemical? x
How much mixture? x+250
Percent Concentration Wanted? 21%, or as decimal, 0.21.

x%2F%28x%2B250%29=0.21